21020222120212 has 24 divisors (see below), whose sum is σ = 42041515711104. Its totient is φ = 9008437022112.

The previous prime is 21020222120197. The next prime is 21020222120297. The reversal of 21020222120212 is 21202122202012.

It is a super-3 number, since 3×21020222120212³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21020222120212.

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, 8446168 + ... + 10647919.

It is an arithmetic number, because the mean of its divisors is an integer number (1751729821296).

Almost surely, 2^{21020222120212} is an apocalyptic number.

It is an amenable number.

21020222120212 is an abundant number, since it is smaller than the sum of its proper divisors (21021293590892).

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

21020222120212 is a wasteful number, since it uses less digits than its factorization.

21020222120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19133415 (or 19133413 counting only the distinct ones).

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

Adding to 21020222120212 its reverse (21202122202012), we get a palindrome (42222344322224).

The spelling of 21020222120212 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twelve".