121555364231 has 32 divisors (see below), whose sum is σ = 157993920000. Its totient is φ = 92900255616.

The previous prime is 121555364209. The next prime is 121555364237. The reversal of 121555364231 is 132463555121.

It is not a de Polignac number, because 121555364231 - 2¹⁸ = 121555102087 is a prime.

It is a super-2 number, since 2×121555364231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555364237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 437801 + ... + 659378.

It is an arithmetic number, because the mean of its divisors is an integer number (4937310000).

Almost surely, 2^121555364231 is an apocalyptic number.

121555364231 is a deficient number, since it is larger than the sum of its proper divisors (36438555769).

121555364231 is a wasteful number, since it uses less digits than its factorization.

121555364231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097236 (or 1097222 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The spelling of 121555364231 in words is "one hundred twenty-one billion, five hundred fifty-five million, three hundred sixty-four thousand, two hundred thirty-one".