621421512447 has 16 divisors (see below), whose sum is σ = 829628577792. Its totient is φ = 413747869920.

The previous prime is 621421512433. The next prime is 621421512461. The reversal of 621421512447 is 744215124126.

It is an interprime number because it is at equal distance from previous prime (621421512433) and next prime (621421512461).

It is not a de Polignac number, because 621421512447 - 2⁴ = 621421512431 is a prime.

It is a super-2 number, since 2×621421512447² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621421512497) 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, 24484558 + ... + 24509924.

It is an arithmetic number, because the mean of its divisors is an integer number (51851786112).

Almost surely, 2^621421512447 is an apocalyptic number.

621421512447 is a deficient number, since it is larger than the sum of its proper divisors (208207065345).

621421512447 is a wasteful number, since it uses less digits than its factorization.

621421512447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35558.

The product of its digits is 107520, while the sum is 39.

The spelling of 621421512447 in words is "six hundred twenty-one billion, four hundred twenty-one million, five hundred twelve thousand, four hundred forty-seven".