421520686992 has 80 divisors (see below), whose sum is σ = 1218625128000. Its totient is φ = 139496034816.

The previous prime is 421520686991. The next prime is 421520687009. The reversal of 421520686992 is 299686025124.

421520686992 is a `hidden beast` number, since 4 + 21 + 520 + 6 + 8 + 6 + 9 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (421520686991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3449817 + ... + 3569912.

It is an arithmetic number, because the mean of its divisors is an integer number (15232814100).

Almost surely, 2^421520686992 is an apocalyptic number.

It is an amenable number.

421520686992 is an abundant number, since it is smaller than the sum of its proper divisors (797104441008).

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

421520686992 is a wasteful number, since it uses less digits than its factorization.

421520686992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019885 (or 7019873 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 421520686992 in words is "four hundred twenty-one billion, five hundred twenty million, six hundred eighty-six thousand, nine hundred ninety-two".