12221121010100 has 18 divisors (see below), whose sum is σ = 26519832592134. Its totient is φ = 4888448404000.

The previous prime is 12221121010069. The next prime is 12221121010127. The reversal of 12221121010100 is 101012112221.

It can be written as a sum of positive squares in 3 ways, for example, as 1714434084496 + 10506686925604 = 1309364^2 + 3241402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61105604951 + ... + 61105605150.

Almost surely, 2^{12221121010100} is an apocalyptic number.

12221121010100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221121010100 is an abundant number, since it is smaller than the sum of its proper divisors (14298711582034).

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

12221121010100 is a wasteful number, since it uses less digits than its factorization.

12221121010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122211210115 (or 122211210108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12221121010100 its reverse (101012112221), we get a palindrome (12322133122321).

The spelling of 12221121010100 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, ten thousand, one hundred".