149973500921 has 4 divisors (see below), whose sum is σ = 151429554432. Its totient is φ = 148517447412.

The previous prime is 149973500909. The next prime is 149973500923. The reversal of 149973500921 is 129005379941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149973500921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149973500921.

It is not an unprimeable number, because it can be changed into a prime (149973500923) 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, 728026601 + ... + 728026806.

It is an arithmetic number, because the mean of its divisors is an integer number (37857388608).

Almost surely, 2^149973500921 is an apocalyptic number.

It is an amenable number.

149973500921 is a deficient number, since it is larger than the sum of its proper divisors (1456053511).

149973500921 is a wasteful number, since it uses less digits than its factorization.

149973500921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456053510.

The product of its (nonzero) digits is 612360, while the sum is 50.

The spelling of 149973500921 in words is "one hundred forty-nine billion, nine hundred seventy-three million, five hundred thousand, nine hundred twenty-one".