421553660 has 48 divisors (see below), whose sum is σ = 1007741952. Its totient is φ = 146625600.

The previous prime is 421553653. The next prime is 421553689. The reversal of 421553660 is 66355124.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

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, 36596 + ... + 46715.

It is an arithmetic number, because the mean of its divisors is an integer number (20994624).

Almost surely, 2^421553660 is an apocalyptic number.

It is an amenable number.

421553660 is an abundant number, since it is smaller than the sum of its proper divisors (586188292).

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

421553660 is a wasteful number, since it uses less digits than its factorization.

421553660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83354 (or 83352 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 421553660 is about 20531.7719644457. The cubic root of 421553660 is about 749.8095279276.

It can be divided in two parts, 4215 and 53660, that added together give a palindrome (57875).

The spelling of 421553660 in words is "four hundred twenty-one million, five hundred fifty-three thousand, six hundred sixty".