21000032110 has 32 divisors (see below), whose sum is σ = 38203488000. Its totient is φ = 8310489600.

The previous prime is 21000032101. The next prime is 21000032111. The reversal of 21000032110 is 1123000012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000032111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1446166 + ... + 1460614.

It is an arithmetic number, because the mean of its divisors is an integer number (1193859000).

Almost surely, 2^21000032110 is an apocalyptic number.

21000032110 is a deficient number, since it is larger than the sum of its proper divisors (17203455890).

21000032110 is a wasteful number, since it uses less digits than its factorization.

21000032110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15996.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21000032110 its reverse (1123000012), we get a palindrome (22123032122).

The spelling of 21000032110 in words is "twenty-one billion, thirty-two thousand, one hundred ten".