21102101013 has 16 divisors (see below), whose sum is σ = 32450591360. Its totient is φ = 11947715136.

The previous prime is 21102100951. The next prime is 21102101029. The reversal of 21102101013 is 31010120112.

It is not a de Polignac number, because 21102101013 - 2⁸ = 21102100757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102101013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102201013) 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, 4607170 + ... + 4611747.

It is an arithmetic number, because the mean of its divisors is an integer number (2028161960).

Almost surely, 2^21102101013 is an apocalyptic number.

It is an amenable number.

21102101013 is a deficient number, since it is larger than the sum of its proper divisors (11348490347).

21102101013 is a wasteful number, since it uses less digits than its factorization.

21102101013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219036.

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

Adding to 21102101013 its reverse (31010120112), we get a palindrome (52112221125).

The spelling of 21102101013 in words is "twenty-one billion, one hundred two million, one hundred one thousand, thirteen".