21220221212022 has 16 divisors (see below), whose sum is σ = 48503362770432. Its totient is φ = 6062920346280.

The previous prime is 21220221212011. The next prime is 21220221212053. The reversal of 21220221212022 is 22021212202212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21220221212022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252621681054 + ... + 252621681137.

It is an arithmetic number, because the mean of its divisors is an integer number (3031460173152).

Almost surely, 2^{21220221212022} is an apocalyptic number.

21220221212022 is an abundant number, since it is smaller than the sum of its proper divisors (27283141558410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220221212022 is a wasteful number, since it uses less digits than its factorization.

21220221212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505243362203.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21220221212022 its reverse (22021212202212), we get a palindrome (43241433414234).

The spelling of 21220221212022 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twelve thousand, twenty-two".