21201212022 has 16 divisors (see below), whose sum is σ = 42421106160. Its totient is φ = 7063956992.

The previous prime is 21201212009. The next prime is 21201212027. The reversal of 21201212022 is 22021210212.

It is a junction number, because it is equal to n+sod(n) for n = 21201211992 and 21201212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201212027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763647 + ... + 790922.

It is an arithmetic number, because the mean of its divisors is an integer number (2651319135).

Almost surely, 2^21201212022 is an apocalyptic number.

21201212022 is an abundant number, since it is smaller than the sum of its proper divisors (21219894138).

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

21201212022 is a wasteful number, since it uses less digits than its factorization.

21201212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556847.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21201212022 its reverse (22021210212), we get a palindrome (43222422234).

The spelling of 21201212022 in words is "twenty-one billion, two hundred one million, two hundred twelve thousand, twenty-two".