21010102201021 has 16 divisors (see below), whose sum is σ = 21702330777600. Its totient is φ = 20318783410800.

The previous prime is 21010102201019. The next prime is 21010102201031. The reversal of 21010102201021 is 12010220101012.

It is a cyclic number.

It is not a de Polignac number, because 21010102201021 - 2¹ = 21010102201019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010102200992 and 21010102201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010102201031) 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, 300285240 + ... + 300355198.

It is an arithmetic number, because the mean of its divisors is an integer number (1356395673600).

Almost surely, 2^{21010102201021} is an apocalyptic number.

It is an amenable number.

21010102201021 is a deficient number, since it is larger than the sum of its proper divisors (692228576579).

21010102201021 is a wasteful number, since it uses less digits than its factorization.

21010102201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76320.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010102201021 its reverse (12010220101012), we get a palindrome (33020322302033).

The spelling of 21010102201021 in words is "twenty-one trillion, ten billion, one hundred two million, two hundred one thousand, twenty-one".