152235721 has 8 divisors (see below), whose sum is σ = 166169664. Its totient is φ = 138317520.

The previous prime is 152235673. The next prime is 152235737. The reversal of 152235721 is 127532251.

152235721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 152235721 - 2⁷ = 152235593 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 152235721.

It is not an unprimeable number, because it can be changed into a prime (152235821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26695 + ... + 31891.

It is an arithmetic number, because the mean of its divisors is an integer number (20771208).

Almost surely, 2^152235721 is an apocalyptic number.

152235721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

152235721 is a deficient number, since it is larger than the sum of its proper divisors (13933943).

152235721 is a wasteful number, since it uses less digits than its factorization.

152235721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7871.

The product of its digits is 4200, while the sum is 28.

The square root of 152235721 is about 12338.3840514064. The cubic root of 152235721 is about 533.9560637073.

Adding to 152235721 its reverse (127532251), we get a palindrome (279767972).

The spelling of 152235721 in words is "one hundred fifty-two million, two hundred thirty-five thousand, seven hundred twenty-one".