21022200212 has 24 divisors (see below), whose sum is σ = 39631259976. Its totient is φ = 9699493248.

The previous prime is 21022200131. The next prime is 21022200223. The reversal of 21022200212 is 21200222012.

It can be written as a sum of positive squares in 4 ways, for example, as 4100353156 + 16921847056 = 64034^2 + 130084^2 .

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, 107018 + ... + 231294.

It is an arithmetic number, because the mean of its divisors is an integer number (1651302499).

Almost surely, 2^21022200212 is an apocalyptic number.

It is an amenable number.

21022200212 is a deficient number, since it is larger than the sum of its proper divisors (18609059764).

21022200212 is a wasteful number, since it uses less digits than its factorization.

21022200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127547 (or 127545 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21022200212 its reverse (21200222012), we get a palindrome (42222422224).

The spelling of 21022200212 in words is "twenty-one billion, twenty-two million, two hundred thousand, two hundred twelve".