21121020222 has 16 divisors (see below), whose sum is σ = 42564500352. Its totient is φ = 6986596760.

The previous prime is 21121020211. The next prime is 21121020229. The reversal of 21121020222 is 22202012112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121020229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13434978 + ... + 13436549.

It is an arithmetic number, because the mean of its divisors is an integer number (2660281272).

Almost surely, 2^21121020222 is an apocalyptic number.

21121020222 is an abundant number, since it is smaller than the sum of its proper divisors (21443480130).

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

21121020222 is a wasteful number, since it uses less digits than its factorization.

21121020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26871663.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21121020222 its reverse (22202012112), we get a palindrome (43323032334).

The spelling of 21121020222 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred twenty-two".