120821575785131 has 16 divisors (see below), whose sum is σ = 130501249822944. Its totient is φ = 111197470013184.

The previous prime is 120821575785049. The next prime is 120821575785151. The reversal of 120821575785131 is 131587575128021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120821575785131 is a prime.

It is a super-2 number, since 2×120821575785131² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (120821575785151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3529445 + ... + 15940518.

It is an arithmetic number, because the mean of its divisors is an integer number (8156328113934).

Almost surely, 2^{120821575785131} is an apocalyptic number.

120821575785131 is a deficient number, since it is larger than the sum of its proper divisors (9679674037813).

120821575785131 is a wasteful number, since it uses less digits than its factorization.

120821575785131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19471390.

The product of its (nonzero) digits is 4704000, while the sum is 56.

The spelling of 120821575785131 in words is "one hundred twenty trillion, eight hundred twenty-one billion, five hundred seventy-five million, seven hundred eighty-five thousand, one hundred thirty-one".