121751537611 has 4 divisors (see below), whose sum is σ = 132819859224. Its totient is φ = 110683216000.

The previous prime is 121751537603. The next prime is 121751537623. The reversal of 121751537611 is 116735157121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116735157121 = 11 ⋅10612287011.

It is a cyclic number.

It is not a de Polignac number, because 121751537611 - 2³ = 121751537603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121751537651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534160790 + ... + 5534160811.

It is an arithmetic number, because the mean of its divisors is an integer number (33204964806).

Almost surely, 2^121751537611 is an apocalyptic number.

121751537611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121751537611 is a deficient number, since it is larger than the sum of its proper divisors (11068321613).

121751537611 is a wasteful number, since it uses less digits than its factorization.

121751537611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11068321612.

The product of its digits is 44100, while the sum is 40.

The spelling of 121751537611 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty-seven thousand, six hundred eleven".