420856129902 has 48 divisors (see below), whose sum is σ = 914145214320. Its totient is φ = 129109833216.

The previous prime is 420856129891. The next prime is 420856129943. The reversal of 420856129902 is 209921658024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274077 + ... + 957512.

It is an arithmetic number, because the mean of its divisors is an integer number (19044691965).

Almost surely, 2^420856129902 is an apocalyptic number.

420856129902 is an abundant number, since it is smaller than the sum of its proper divisors (493289084418).

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

420856129902 is a wasteful number, since it uses less digits than its factorization.

420856129902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231957 (or 1231944 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 420856129902 in words is "four hundred twenty billion, eight hundred fifty-six million, one hundred twenty-nine thousand, nine hundred two".