21022212304 has 10 divisors (see below), whose sum is σ = 40730536370. Its totient is φ = 10511106144.

The previous prime is 21022212227. The next prime is 21022212307. The reversal of 21022212304 is 40321222012.

It can be written as a sum of positive squares in only one way, i.e., 16842848400 + 4179363904 = 129780^2 + 64648^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022212307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656944119 + ... + 656944150.

It is an arithmetic number, because the mean of its divisors is an integer number (4073053637).

Almost surely, 2^21022212304 is an apocalyptic number.

It is an amenable number.

21022212304 is a deficient number, since it is larger than the sum of its proper divisors (19708324066).

21022212304 is a wasteful number, since it uses less digits than its factorization.

21022212304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313888277 (or 1313888271 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21022212304 its reverse (40321222012), we get a palindrome (61343434316).

The spelling of 21022212304 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand, three hundred four".