21122221002 has 16 divisors (see below), whose sum is σ = 43274794752. Its totient is φ = 6869014880.

The previous prime is 21122220953. The next prime is 21122221007. The reversal of 21122221002 is 20012222112.

It is a super-2 number, since 2×21122221002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122221007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42931098 + ... + 42931589.

It is an arithmetic number, because the mean of its divisors is an integer number (2704674672).

Almost surely, 2^21122221002 is an apocalyptic number.

21122221002 is an abundant number, since it is smaller than the sum of its proper divisors (22152573750).

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

21122221002 is a wasteful number, since it uses less digits than its factorization.

21122221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85862733.

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

Adding to 21122221002 its reverse (20012222112), we get a palindrome (41134443114).

The spelling of 21122221002 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, two".