321631754021 has 4 divisors (see below), whose sum is σ = 322729473612. Its totient is φ = 320534034432.

The previous prime is 321631753957. The next prime is 321631754053. The reversal of 321631754021 is 120457136123.

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 308086053025 + 13545700996 = 555055^2 + 116386^2 .

It is a cyclic number.

It is not a de Polignac number, because 321631754021 - 2⁶ = 321631753957 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 (321631754221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548859356 + ... + 548859941.

It is an arithmetic number, because the mean of its divisors is an integer number (80682368403).

Almost surely, 2^321631754021 is an apocalyptic number.

It is an amenable number.

321631754021 is a deficient number, since it is larger than the sum of its proper divisors (1097719591).

321631754021 is a wasteful number, since it uses less digits than its factorization.

321631754021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097719590.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 321631754021 in words is "three hundred twenty-one billion, six hundred thirty-one million, seven hundred fifty-four thousand, twenty-one".