21110032120 has 32 divisors (see below), whose sum is σ = 47519006400. Its totient is φ = 8440202368.

The previous prime is 21110032079. The next prime is 21110032121. The reversal of 21110032120 is 2123001112.

It is a super-2 number, since 2×21110032120² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21110032120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110032121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28480 + ... + 207439.

It is an arithmetic number, because the mean of its divisors is an integer number (1484968950).

Almost surely, 2^21110032120 is an apocalyptic number.

21110032120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110032120 is an abundant number, since it is smaller than the sum of its proper divisors (26408974280).

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

21110032120 is a wasteful number, since it uses less digits than its factorization.

21110032120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238167 (or 238163 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21110032120 its reverse (2123001112), we get a palindrome (23233033232).

The spelling of 21110032120 in words is "twenty-one billion, one hundred ten million, thirty-two thousand, one hundred twenty".