421971641520 has 320 divisors, whose sum is σ = 1578342979584. Its totient is φ = 91874856960.

The previous prime is 421971641501. The next prime is 421971641521. The reversal of 421971641520 is 25146179124.

It is not an unprimeable number, because it can be changed into a prime (421971641521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1103689 + ... + 1435991.

Almost surely, 2^421971641520 is an apocalyptic number.

421971641520 is a gapful number since it is divisible by the number (40) 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 421971641520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789171489792).

421971641520 is an abundant number, since it is smaller than the sum of its proper divisors (1156371338064).

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

421971641520 is a wasteful number, since it uses less digits than its factorization.

421971641520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332380 (or 332374 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 421971641520 in words is "four hundred twenty-one billion, nine hundred seventy-one million, six hundred forty-one thousand, five hundred twenty".