21022021211021 has 16 divisors (see below), whose sum is σ = 22049950844160. Its totient is φ = 20018305679040.

The previous prime is 21022021211003. The next prime is 21022021211027. The reversal of 21022021211021 is 12011212022012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022021211021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022021211027) 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, 185353751 + ... + 185467131.

It is an arithmetic number, because the mean of its divisors is an integer number (1378121927760).

Almost surely, 2^{21022021211021} is an apocalyptic number.

It is an amenable number.

21022021211021 is a deficient number, since it is larger than the sum of its proper divisors (1027929633139).

21022021211021 is a wasteful number, since it uses less digits than its factorization.

21022021211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220084.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21022021211021 its reverse (12011212022012), we get a palindrome (33033233233033).

The spelling of 21022021211021 in words is "twenty-one trillion, twenty-two billion, twenty-one million, two hundred eleven thousand, twenty-one".