421533215640 has 64 divisors (see below), whose sum is σ = 1405110722400. Its totient is φ = 112408857216.

The previous prime is 421533215539. The next prime is 421533215651. The reversal of 421533215640 is 46512335124.

421533215640 is a `hidden beast` number, since 4 + 2 + 1 + 5 + 3 + 3 + 2 + 1 + 5 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 421533215595 and 421533215604.

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, 195153187 + ... + 195155346.

Almost surely, 2^421533215640 is an apocalyptic number.

421533215640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421533215640 is an abundant number, since it is smaller than the sum of its proper divisors (983577506760).

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

421533215640 is a wasteful number, since it uses less digits than its factorization.

421533215640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390308553 (or 390308543 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 421533215640 in words is "four hundred twenty-one billion, five hundred thirty-three million, two hundred fifteen thousand, six hundred forty".