121551244164 has 135 divisors (see below), whose sum is σ = 369771612903. Its totient is φ = 34716375792.

The previous prime is 121551244141. The next prime is 121551244181. The reversal of 121551244164 is 461442155121.

The square root of 121551244164 is 348642.

It is a perfect power (a square), and thus also a powerful number.

121551244164 is a `hidden beast` number, since 1 + 2 + 1 + 551 + 2 + 4 + 41 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 43927509 + ... + 43930275.

Almost surely, 2^121551244164 is an apocalyptic number.

121551244164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121551244164 is the 348642-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121551244164

121551244164 is an abundant number, since it is smaller than the sum of its proper divisors (248220368739).

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

121551244164 is an frugal number, since it uses more digits than its factorization.

121551244164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564 (or 2779 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

Multiplying 121551244164 by its sum of digits (36), we get a square (4375844789904 = 2091852²).

121551244164 divided by its sum of digits (36) gives a square (3376423449 = 58107²).

Adding to 121551244164 its reverse (461442155121), we get a palindrome (582993399285).

The spelling of 121551244164 in words is "one hundred twenty-one billion, five hundred fifty-one million, two hundred forty-four thousand, one hundred sixty-four".