321998356 has 6 divisors (see below), whose sum is σ = 563497130. Its totient is φ = 160999176.

The previous prime is 321998329. The next prime is 321998357. The reversal of 321998356 is 653899123.

It is a happy number.

321998356 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 319837456 + 2160900 = 17884^2 + 1470^2 .

321998356 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321998357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40249791 + ... + 40249798.

Almost surely, 2^321998356 is an apocalyptic number.

It is an amenable number.

321998356 is a deficient number, since it is larger than the sum of its proper divisors (241498774).

321998356 is a wasteful number, since it uses less digits than its factorization.

321998356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80499593 (or 80499591 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The square root of 321998356 is about 17944.3126365988. The cubic root of 321998356 is about 685.4112337030.

The spelling of 321998356 in words is "three hundred twenty-one million, nine hundred ninety-eight thousand, three hundred fifty-six".