21120100113 has 16 divisors (see below), whose sum is σ = 32967962496. Its totient is φ = 11774271360.

The previous prime is 21120100109. The next prime is 21120100147. The reversal of 21120100113 is 31100102112.

It is not a de Polignac number, because 21120100113 - 2² = 21120100109 is a prime.

It is a super-2 number, since 2×21120100113² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21120100103) 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, 12264006 + ... + 12265727.

It is an arithmetic number, because the mean of its divisors is an integer number (2060497656).

Almost surely, 2^21120100113 is an apocalyptic number.

It is an amenable number.

21120100113 is a deficient number, since it is larger than the sum of its proper divisors (11847862383).

21120100113 is a wasteful number, since it uses less digits than its factorization.

21120100113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24529784.

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

Adding to 21120100113 its reverse (31100102112), we get a palindrome (52220202225).

The spelling of 21120100113 in words is "twenty-one billion, one hundred twenty million, one hundred thousand, one hundred thirteen".