21210040332 has 72 divisors (see below), whose sum is σ = 58278192336. Its totient is φ = 6465158784.

The previous prime is 21210040289. The next prime is 21210040339. The reversal of 21210040332 is 23304001212.

21210040332 is a `hidden beast` number, since 21 + 210 + 0 + 403 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21210040339) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161703 + ... + 261854.

It is an arithmetic number, because the mean of its divisors is an integer number (809419338).

Almost surely, 2^21210040332 is an apocalyptic number.

It is an amenable number.

21210040332 is an abundant number, since it is smaller than the sum of its proper divisors (37068152004).

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

21210040332 is a wasteful number, since it uses less digits than its factorization.

21210040332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423687 (or 423682 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21210040332 its reverse (23304001212), we get a palindrome (44514041544).

The spelling of 21210040332 in words is "twenty-one billion, two hundred ten million, forty thousand, three hundred thirty-two".