121755720730 has 32 divisors (see below), whose sum is σ = 251562695040. Its totient is φ = 41562521280.

The previous prime is 121755720707. The next prime is 121755720763. The reversal of 121755720730 is 37027557121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3781716 + ... + 3813775.

It is an arithmetic number, because the mean of its divisors is an integer number (7861334220).

Almost surely, 2^121755720730 is an apocalyptic number.

121755720730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121755720730 is an abundant number, since it is smaller than the sum of its proper divisors (129806974310).

121755720730 is a wasteful number, since it uses less digits than its factorization.

121755720730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7595734.

The product of its (nonzero) digits is 102900, while the sum is 40.

The spelling of 121755720730 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred twenty thousand, seven hundred thirty".