421309979904 has 144 divisors (see below), whose sum is σ = 1225226580480. Its totient is φ = 127461857280.

The previous prime is 421309979863. The next prime is 421309979939. The reversal of 421309979904 is 409979903124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5189029 + ... + 5269595.

It is an arithmetic number, because the mean of its divisors is an integer number (8508517920).

Almost surely, 2^421309979904 is an apocalyptic number.

421309979904 is a gapful number since it is divisible by the number (44) 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 421309979904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (612613290240).

421309979904 is an abundant number, since it is smaller than the sum of its proper divisors (803916600576).

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

421309979904 is a wasteful number, since it uses less digits than its factorization.

421309979904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81216 (or 81202 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 57.

The spelling of 421309979904 in words is "four hundred twenty-one billion, three hundred nine million, nine hundred seventy-nine thousand, nine hundred four".