1621431082317 has 16 divisors (see below), whose sum is σ = 2298468348288. Its totient is φ = 1014447445440.

The previous prime is 1621431082301. The next prime is 1621431082331. The reversal of 1621431082317 is 7132801341261.

It is not a de Polignac number, because 1621431082317 - 2⁴ = 1621431082301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621431082367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221685034 + ... + 221692347.

It is an arithmetic number, because the mean of its divisors is an integer number (143654271768).

Almost surely, 2^{1621431082317} is an apocalyptic number.

It is an amenable number.

1621431082317 is a deficient number, since it is larger than the sum of its proper divisors (677037265971).

1621431082317 is a wasteful number, since it uses less digits than its factorization.

1621431082317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443377460.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 1621431082317 in words is "one trillion, six hundred twenty-one billion, four hundred thirty-one million, eighty-two thousand, three hundred seventeen".