121687252570 has 64 divisors (see below), whose sum is σ = 241756298784. Its totient is φ = 43813601280.

The previous prime is 121687252501. The next prime is 121687252571. The reversal of 121687252570 is 75252786121.

It is a happy number.

It is a Cunningham number, because it is equal to 348837²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 260790201 + 121426462369 = 16149^2 + 348463^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121687252570.

It is not an unprimeable number, because it can be changed into a prime (121687252571) 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, 14669344 + ... + 14677636.

Almost surely, 2^121687252570 is an apocalyptic number.

121687252570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121687252570 is a deficient number, since it is larger than the sum of its proper divisors (120069046214).

121687252570 is a wasteful number, since it uses less digits than its factorization.

121687252570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11107.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 121687252570 in words is "one hundred twenty-one billion, six hundred eighty-seven million, two hundred fifty-two thousand, five hundred seventy".