157143921 has 32 divisors (see below), whose sum is σ = 236390400. Its totient is φ = 92018880.

The previous prime is 157143901. The next prime is 157143923. The reversal of 157143921 is 129341751.

It is not a de Polignac number, because 157143921 - 2⁷ = 157143793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (157143923) 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, 218200 + ... + 218918.

It is an arithmetic number, because the mean of its divisors is an integer number (7387200).

Almost surely, 2^157143921 is an apocalyptic number.

157143921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157143921 is a deficient number, since it is larger than the sum of its proper divisors (79246479).

157143921 is a wasteful number, since it uses less digits than its factorization.

157143921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its digits is 7560, while the sum is 33.

The square root of 157143921 is about 12535.7058437090. The cubic root of 157143921 is about 539.6338636015.

The spelling of 157143921 in words is "one hundred fifty-seven million, one hundred forty-three thousand, nine hundred twenty-one".