21023220321122 has 16 divisors (see below), whose sum is σ = 31596509403000. Its totient is φ = 10491051991680.

The previous prime is 21023220321107. The next prime is 21023220321211. The reversal of 21023220321122 is 22112302232012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8690474057521 + 12332746263601 = 2947961^2 + 3511801^2 .

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, 29394704 + ... + 30101412.

Almost surely, 2^{21023220321122} is an apocalyptic number.

21023220321122 is a deficient number, since it is larger than the sum of its proper divisors (10573289081878).

21023220321122 is a wasteful number, since it uses less digits than its factorization.

21023220321122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735781.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21023220321122 its reverse (22112302232012), we get a palindrome (43135522553134).

The spelling of 21023220321122 in words is "twenty-one trillion, twenty-three billion, two hundred twenty million, three hundred twenty-one thousand, one hundred twenty-two".