50156721 has 24 divisors (see below), whose sum is σ = 75928320. Its totient is φ = 31844736.

The previous prime is 50156707. The next prime is 50156731. The reversal of 50156721 is 12765105.

It is not a de Polignac number, because 50156721 - 2⁶ = 50156657 is a prime.

It is a super-2 number, since 2×50156721² = 5031393322943682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (50156731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69400 + ... + 70118.

It is an arithmetic number, because the mean of its divisors is an integer number (3163680).

Almost surely, 2^50156721 is an apocalyptic number.

It is an amenable number.

50156721 is a deficient number, since it is larger than the sum of its proper divisors (25771599).

50156721 is a wasteful number, since it uses less digits than its factorization.

50156721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 50156721 is about 7082.1409898420. The cubic root of 50156721 is about 368.7876584733.

The spelling of 50156721 in words is "fifty million, one hundred fifty-six thousand, seven hundred twenty-one".