21222012022021 has 16 divisors (see below), whose sum is σ = 22601092494400. Its totient is φ = 19869729504768.

The previous prime is 21222012021989. The next prime is 21222012022037. The reversal of 21222012022021 is 12022021022212.

It is a cyclic number.

It is not a de Polignac number, because 21222012022021 - 2⁵ = 21222012021989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222012022021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222012022061) 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, 6813855 + ... + 9427228.

It is an arithmetic number, because the mean of its divisors is an integer number (1412568280900).

Almost surely, 2^{21222012022021} is an apocalyptic number.

It is an amenable number.

21222012022021 is a deficient number, since it is larger than the sum of its proper divisors (1379080472379).

21222012022021 is a wasteful number, since it uses less digits than its factorization.

21222012022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16241908.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222012022021 its reverse (12022021022212), we get a palindrome (33244033044233).

The spelling of 21222012022021 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, twenty-two thousand, twenty-one".