12420621 has 40 divisors (see below), whose sum is σ = 19863360. Its totient is φ = 7717248.

The previous prime is 12420619. The next prime is 12420649. The reversal of 12420621 is 12602421.

12420621 is a `hidden beast` number, since 1 + 2 + 42 + 0 + 621 = 666.

12420621 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12420621 - 2¹ = 12420619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12420594 and 12420603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420691) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 109861 + ... + 109973.

It is an arithmetic number, because the mean of its divisors is an integer number (496584).

Almost surely, 2^12420621 is an apocalyptic number.

It is an amenable number.

12420621 is a deficient number, since it is larger than the sum of its proper divisors (7442739).

12420621 is a wasteful number, since it uses less digits than its factorization.

12420621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 198 counting only the distinct ones).

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

The square root of 12420621 is about 3524.2901412909. The cubic root of 12420621 is about 231.5871385378.

It can be divided in two parts, 12420 and 621, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 12420621 in words is "twelve million, four hundred twenty thousand, six hundred twenty-one".