1621380238031 has 16 divisors (see below), whose sum is σ = 1669698078720. Its totient is φ = 1573664375520.

The previous prime is 1621380238021. The next prime is 1621380238043. The reversal of 1621380238031 is 1308320831261.

It is a cyclic number.

It is not a de Polignac number, because 1621380238031 - 2¹⁴ = 1621380221647 is a prime.

It is a super-2 number, since 2×1621380238031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621380238021) 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, 5587946 + ... + 5870936.

It is an arithmetic number, because the mean of its divisors is an integer number (104356129920).

Almost surely, 2^{1621380238031} is an apocalyptic number.

1621380238031 is a deficient number, since it is larger than the sum of its proper divisors (48317840689).

1621380238031 is a wasteful number, since it uses less digits than its factorization.

1621380238031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284054.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 1621380238031 in words is "one trillion, six hundred twenty-one billion, three hundred eighty million, two hundred thirty-eight thousand, thirty-one".