21012320110 has 48 divisors (see below), whose sum is σ = 40936254336. Its totient is φ = 7761208832.

The previous prime is 21012320107. The next prime is 21012320117. The reversal of 21012320110 is 1102321012.

It is a super-2 number, since 2×21012320110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012320117) 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, 84579 + ... + 221761.

It is an arithmetic number, because the mean of its divisors is an integer number (852838632).

Almost surely, 2^21012320110 is an apocalyptic number.

21012320110 is a deficient number, since it is larger than the sum of its proper divisors (19923934226).

21012320110 is a wasteful number, since it uses less digits than its factorization.

21012320110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137277 (or 137260 counting only the distinct ones).

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

Adding to 21012320110 its reverse (1102321012), we get a palindrome (22114641122).

The spelling of 21012320110 in words is "twenty-one billion, twelve million, three hundred twenty thousand, one hundred ten".