21113123110 has 32 divisors (see below), whose sum is σ = 38178138240. Its totient is φ = 8406515712.

The previous prime is 21113123107. The next prime is 21113123177. The reversal of 21113123110 is 1132131112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7109706 + ... + 7112674.

It is an arithmetic number, because the mean of its divisors is an integer number (1193066820).

Almost surely, 2^21113123110 is an apocalyptic number.

21113123110 is a deficient number, since it is larger than the sum of its proper divisors (17065015130).

21113123110 is a wasteful number, since it uses less digits than its factorization.

21113123110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21113123110 its reverse (1132131112), we get a palindrome (22245254222).

The spelling of 21113123110 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty-three thousand, one hundred ten".