21120210332 has 12 divisors (see below), whose sum is σ = 39803473416. Its totient is φ = 9747789360.

The previous prime is 21120210311. The next prime is 21120210337. The reversal of 21120210332 is 23301202112.

It is a self number, because there is not a number n which added to its sum of digits gives 21120210332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120210337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203078894 + ... + 203078997.

It is an arithmetic number, because the mean of its divisors is an integer number (3316956118).

Almost surely, 2^21120210332 is an apocalyptic number.

It is an amenable number.

21120210332 is a deficient number, since it is larger than the sum of its proper divisors (18683263084).

21120210332 is a wasteful number, since it uses less digits than its factorization.

21120210332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406157908 (or 406157906 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120210332 its reverse (23301202112), we get a palindrome (44421412444).

The spelling of 21120210332 in words is "twenty-one billion, one hundred twenty million, two hundred ten thousand, three hundred thirty-two".