21121020222222 has 16 divisors (see below), whose sum is σ = 42249067972992. Its totient is φ = 7039168819320.

The previous prime is 21121020222209. The next prime is 21121020222257. The reversal of 21121020222222 is 22222202012112.

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, 292774618 + ... + 292846749.

It is an arithmetic number, because the mean of its divisors is an integer number (2640566748312).

Almost surely, 2^{21121020222222} is an apocalyptic number.

21121020222222 is an abundant number, since it is smaller than the sum of its proper divisors (21128047750770).

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

21121020222222 is a wasteful number, since it uses less digits than its factorization.

21121020222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585627383.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21121020222222 its reverse (22222202012112), we get a palindrome (43343222234334).

The spelling of 21121020222222 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twenty-two thousand, two hundred twenty-two".