21012021202022 has 16 divisors (see below), whose sum is σ = 33234374534640. Its totient is φ = 9935812988928.

The previous prime is 21012021201949. The next prime is 21012021202057. The reversal of 21012021202022 is 22020212021012.

It is a happy number.

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, 479135723 + ... + 479179574.

It is an arithmetic number, because the mean of its divisors is an integer number (2077148408415).

Almost surely, 2^{21012021202022} is an apocalyptic number.

21012021202022 is a deficient number, since it is larger than the sum of its proper divisors (12222353332618).

21012021202022 is a wasteful number, since it uses less digits than its factorization.

21012021202022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958315895.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21012021202022 its reverse (22020212021012), we get a palindrome (43032233223034).

The spelling of 21012021202022 in words is "twenty-one trillion, twelve billion, twenty-one million, two hundred two thousand, twenty-two".