21021012112222 has 32 divisors (see below), whose sum is σ = 33353440560000. Its totient is φ = 9908725927968.

The previous prime is 21021012112171. The next prime is 21021012112229. The reversal of 21021012112222 is 22221121012012.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21021012112222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021012112229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4982428 + ... + 8177200.

It is an arithmetic number, because the mean of its divisors is an integer number (1042295017500).

Almost surely, 2^{21021012112222} is an apocalyptic number.

21021012112222 is a deficient number, since it is larger than the sum of its proper divisors (12332428447778).

21021012112222 is a wasteful number, since it uses less digits than its factorization.

21021012112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195640.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021012112222 its reverse (22221121012012), we get a palindrome (43242133124234).

The spelling of 21021012112222 in words is "twenty-one trillion, twenty-one billion, twelve million, one hundred twelve thousand, two hundred twenty-two".