21118062420 has 480 divisors, whose sum is σ = 84184590336. Its totient is φ = 4311014400.

The previous prime is 21118062409. The next prime is 21118062443. The reversal of 21118062420 is 2426081112.

21118062420 is a `hidden beast` number, since 2 + 1 + 1 + 18 + 0 + 624 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 4567710 + ... + 4572330.

Almost surely, 2^21118062420 is an apocalyptic number.

21118062420 is a gapful number since it is divisible by the number (20) 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 21118062420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42092295168).

21118062420 is an abundant number, since it is smaller than the sum of its proper divisors (63066527916).

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

21118062420 is a wasteful number, since it uses less digits than its factorization.

21118062420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4693 (or 4682 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 21118062420 in words is "twenty-one billion, one hundred eighteen million, sixty-two thousand, four hundred twenty".