21112222201021 has 16 divisors (see below), whose sum is σ = 24641850654720. Its totient is φ = 17711000100720.

The previous prime is 21112222201003. The next prime is 21112222201033. The reversal of 21112222201021 is 12010222221112.

It is a cyclic number.

It is not a de Polignac number, because 21112222201021 - 2²³ = 21112213812413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112222201021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112222202021) 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, 45893970 + ... + 46351708.

It is an arithmetic number, because the mean of its divisors is an integer number (1540115665920).

Almost surely, 2^{21112222201021} is an apocalyptic number.

It is an amenable number.

21112222201021 is a deficient number, since it is larger than the sum of its proper divisors (3529628453699).

21112222201021 is a wasteful number, since it uses less digits than its factorization.

21112222201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597984.

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

Adding to 21112222201021 its reverse (12010222221112), we get a palindrome (33122444422133).

The spelling of 21112222201021 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, two hundred one thousand, twenty-one".