232151021 has 4 divisors (see below), whose sum is σ = 233845692. Its totient is φ = 230456352.

The previous prime is 232151011. The next prime is 232151027. The reversal of 232151021 is 120151232.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133148521 + 99002500 = 11539^2 + 9950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232151021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (232151027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847130 + ... + 847403.

It is an arithmetic number, because the mean of its divisors is an integer number (58461423).

Almost surely, 2^232151021 is an apocalyptic number.

It is an amenable number.

232151021 is a deficient number, since it is larger than the sum of its proper divisors (1694671).

232151021 is a wasteful number, since it uses less digits than its factorization.

232151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694670.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 232151021 is about 15236.5029124140. The cubic root of 232151021 is about 614.5966650563.

The spelling of 232151021 in words is "two hundred thirty-two million, one hundred fifty-one thousand, twenty-one".