621431504120822 has 4 divisors (see below), whose sum is σ = 932147256181236. Its totient is φ = 310715752060410.

The previous prime is 621431504120741. The next prime is 621431504120849. The reversal of 621431504120822 is 228021405134126.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×621431504120822² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 621431504120822.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155357876030204 + ... + 155357876030207.

It is an arithmetic number, because the mean of its divisors is an integer number (233036814045309).

Almost surely, 2^{621431504120822} is an apocalyptic number.

621431504120822 is a deficient number, since it is larger than the sum of its proper divisors (310715752060414).

621431504120822 is a wasteful number, since it uses less digits than its factorization.

621431504120822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310715752060413.

The product of its (nonzero) digits is 184320, while the sum is 41.

Adding to 621431504120822 its reverse (228021405134126), we get a palindrome (849452909254948).

The spelling of 621431504120822 in words is "six hundred twenty-one trillion, four hundred thirty-one billion, five hundred four million, one hundred twenty thousand, eight hundred twenty-two".