21010102101 has 12 divisors (see below), whose sum is σ = 30775361760. Its totient is φ = 13809456360.

The previous prime is 21010102097. The next prime is 21010102181. The reversal of 21010102101 is 10120101012.

It is a happy number.

It is not a de Polignac number, because 21010102101 - 2² = 21010102097 is a prime.

It is a super-2 number, since 2×21010102101² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010102181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16439191 + ... + 16440468.

It is an arithmetic number, because the mean of its divisors is an integer number (2564613480).

Almost surely, 2^21010102101 is an apocalyptic number.

It is an amenable number.

21010102101 is a deficient number, since it is larger than the sum of its proper divisors (9765259659).

21010102101 is a wasteful number, since it uses less digits than its factorization.

21010102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32879736 (or 32879733 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21010102101 its reverse (10120101012), we get a palindrome (31130203113).

The spelling of 21010102101 in words is "twenty-one billion, ten million, one hundred two thousand, one hundred one".