12121222022100 has 54 divisors (see below), whose sum is σ = 37993297029870. Its totient is φ = 3232325872320.

The previous prime is 12121222022081. The next prime is 12121222022113. The reversal of 12121222022100 is 122022212121.

It is a happy number.

12121222022100 is a `hidden beast` number, since 1 + 21 + 212 + 220 + 2 + 210 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 2096437576464 + 10024784445636 = 1447908^2 + 3166194^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6734011335 + ... + 6734013134.

Almost surely, 2^{12121222022100} is an apocalyptic number.

12121222022100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121222022100 is an abundant number, since it is smaller than the sum of its proper divisors (25872075007770).

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

12121222022100 is a wasteful number, since it uses less digits than its factorization.

12121222022100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468024489 (or 13468024479 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121222022100 its reverse (122022212121), we get a palindrome (12243244234221).

The spelling of 12121222022100 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-two thousand, one hundred".