321242157 has 12 divisors (see below), whose sum is σ = 464746464. Its totient is φ = 213824520.

The previous prime is 321242123. The next prime is 321242179. The reversal of 321242157 is 751242123.

It is not a de Polignac number, because 321242157 - 2¹² = 321238061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321242157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321243157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21969 + ... + 33542.

It is an arithmetic number, because the mean of its divisors is an integer number (38728872).

Almost surely, 2^321242157 is an apocalyptic number.

It is an amenable number.

321242157 is a deficient number, since it is larger than the sum of its proper divisors (143504307).

321242157 is a wasteful number, since it uses less digits than its factorization.

321242157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56160 (or 56157 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 321242157 is about 17923.2295359960. The cubic root of 321242157 is about 684.8742604021.

It can be divided in two parts, 3212 and 42157, that added together give a square (45369 = 213²).

The spelling of 321242157 in words is "three hundred twenty-one million, two hundred forty-two thousand, one hundred fifty-seven".