121002757557 has 64 divisors (see below), whose sum is σ = 185193271296. Its totient is φ = 69561423360.

The previous prime is 121002757537. The next prime is 121002757609. The reversal of 121002757557 is 755757200121.

It is not a de Polignac number, because 121002757557 - 2⁶ = 121002757493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002757507) 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 63 ways as a sum of consecutive naturals, for example, 117136713 + ... + 117137745.

It is an arithmetic number, because the mean of its divisors is an integer number (2893644864).

Almost surely, 2^121002757557 is an apocalyptic number.

It is an amenable number.

121002757557 is a deficient number, since it is larger than the sum of its proper divisors (64190513739).

121002757557 is a wasteful number, since it uses less digits than its factorization.

121002757557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

The product of its (nonzero) digits is 171500, while the sum is 42.

Adding to 121002757557 its reverse (755757200121), we get a palindrome (876759957678).

The spelling of 121002757557 in words is "one hundred twenty-one billion, two million, seven hundred fifty-seven thousand, five hundred fifty-seven".