421640204252 has 72 divisors (see below), whose sum is σ = 831016905264. Its totient is φ = 186398198784.

The previous prime is 421640204189. The next prime is 421640204267. The reversal of 421640204252 is 252402046124.

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, 2016323 + ... + 2215589.

It is an arithmetic number, because the mean of its divisors is an integer number (11541901462).

Almost surely, 2^421640204252 is an apocalyptic number.

It is an amenable number.

421640204252 is a deficient number, since it is larger than the sum of its proper divisors (409376701012).

421640204252 is a wasteful number, since it uses less digits than its factorization.

421640204252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199383 (or 199352 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

The spelling of 421640204252 in words is "four hundred twenty-one billion, six hundred forty million, two hundred four thousand, two hundred fifty-two".