21100202211021 has 16 divisors (see below), whose sum is σ = 29104875511104. Its totient is φ = 13586715321984.

The previous prime is 21100202211007. The next prime is 21100202211031. The reversal of 21100202211021 is 12011220200112.

It is not a de Polignac number, because 21100202211021 - 2⁹ = 21100202210509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100202211031) 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, 693750895 + ... + 693781308.

It is an arithmetic number, because the mean of its divisors is an integer number (1819054719444).

Almost surely, 2^{21100202211021} is an apocalyptic number.

It is an amenable number.

21100202211021 is a deficient number, since it is larger than the sum of its proper divisors (8004673300083).

21100202211021 is a wasteful number, since it uses less digits than its factorization.

21100202211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387532380.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21100202211021 its reverse (12011220200112), we get a palindrome (33111422411133).

The spelling of 21100202211021 in words is "twenty-one trillion, one hundred billion, two hundred two million, two hundred eleven thousand, twenty-one".