12621420 has 216 divisors, whose sum is σ = 47056464. Its totient is φ = 2830464.

The previous prime is 12621419. The next prime is 12621421. The reversal of 12621420 is 2412621.

12621420 is a `hidden beast` number, since 1 + 2 + 621 + 42 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (12621419) and next prime (12621421).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12621393 and 12621402.

It is not an unprimeable number, because it can be changed into a prime (12621421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 238114 + ... + 238166.

It is an arithmetic number, because the mean of its divisors is an integer number (217854).

Almost surely, 2^12621420 is an apocalyptic number.

12621420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12621420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23528232).

12621420 is an abundant number, since it is smaller than the sum of its proper divisors (34435044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12621420 is a wasteful number, since it uses less digits than its factorization.

12621420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12621420 is about 3552.6637893277. The cubic root of 12621420 is about 232.8284639444.

It can be divided in two parts, 12621 and 420, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 12621420 in words is "twelve million, six hundred twenty-one thousand, four hundred twenty".