21102120110 has 32 divisors (see below), whose sum is σ = 38395661472. Its totient is φ = 8349419520.

The previous prime is 21102120107. The next prime is 21102120133. The reversal of 21102120110 is 1102120112.

It is a junction number, because it is equal to n+sod(n) for n = 21102120091 and 21102120100.

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, 2316665 + ... + 2325755.

It is an arithmetic number, because the mean of its divisors is an integer number (1199864421).

Almost surely, 2^21102120110 is an apocalyptic number.

21102120110 is a deficient number, since it is larger than the sum of its proper divisors (17293541362).

21102120110 is a wasteful number, since it uses less digits than its factorization.

21102120110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11588.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102120110 its reverse (1102120112), we get a palindrome (22204240222).

The spelling of 21102120110 in words is "twenty-one billion, one hundred two million, one hundred twenty thousand, one hundred ten".