121257571028 has 24 divisors (see below), whose sum is σ = 232327460064. Its totient is φ = 54918093600.

The previous prime is 121257571027. The next prime is 121257571073. The reversal of 121257571028 is 820175752121.

It is a super-2 number, since 2×121257571028² (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 (121257571027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4962278 + ... + 4986653.

It is an arithmetic number, because the mean of its divisors is an integer number (9680310836).

Almost surely, 2^121257571028 is an apocalyptic number.

It is an amenable number.

121257571028 is a deficient number, since it is larger than the sum of its proper divisors (111069889036).

121257571028 is a wasteful number, since it uses less digits than its factorization.

121257571028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9949223 (or 9949221 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 41.

The spelling of 121257571028 in words is "one hundred twenty-one billion, two hundred fifty-seven million, five hundred seventy-one thousand, twenty-eight".