21102201211021 has 16 divisors (see below), whose sum is σ = 24370679620224. Its totient is φ = 17897272740864.

The previous prime is 21102201210989. The next prime is 21102201211079. The reversal of 21102201211021 is 12011210220112.

It is a cyclic number.

It is not a de Polignac number, because 21102201211021 - 2⁵ = 21102201210989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102201210986 and 21102201211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102201212021) 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, 194200 + ... + 6499393.

It is an arithmetic number, because the mean of its divisors is an integer number (1523167476264).

Almost surely, 2^{21102201211021} is an apocalyptic number.

It is an amenable number.

21102201211021 is a deficient number, since it is larger than the sum of its proper divisors (3268478409203).

21102201211021 is an equidigital number, since it uses as much as digits as its factorization.

21102201211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698340.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21102201211021 its reverse (12011210220112), we get a palindrome (33113411431133).

Subtracting from 21102201211021 its reverse (12011210220112), we obtain a palindrome (9090990990909).

The spelling of 21102201211021 in words is "twenty-one trillion, one hundred two billion, two hundred one million, two hundred eleven thousand, twenty-one".