150721535721 has 16 divisors (see below), whose sum is σ = 201974879808. Its totient is φ = 99975168000.

The previous prime is 150721535707. The next prime is 150721535737. The reversal of 150721535721 is 127535127051.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-150721535721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 150721535721.

It is not an unprimeable number, because it can be changed into a prime (150721535621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021161 + ... + 1159401.

It is an arithmetic number, because the mean of its divisors is an integer number (12623429988).

Almost surely, 2^150721535721 is an apocalyptic number.

It is an amenable number.

150721535721 is a deficient number, since it is larger than the sum of its proper divisors (51253344087).

150721535721 is a wasteful number, since it uses less digits than its factorization.

150721535721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140072.

The product of its (nonzero) digits is 73500, while the sum is 39.

The spelling of 150721535721 in words is "one hundred fifty billion, seven hundred twenty-one million, five hundred thirty-five thousand, seven hundred twenty-one".