621062597021 has 4 divisors (see below), whose sum is σ = 622727644572. Its totient is φ = 619397549472.

The previous prime is 621062596993. The next prime is 621062597041. The reversal of 621062597021 is 120795260126.

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 444842311225 + 176220285796 = 666965^2 + 419786^2 .

It is a cyclic number.

It is not a de Polignac number, because 621062597021 - 2³⁰ = 619988855197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621062597021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621062597041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832523216 + ... + 832523961.

It is an arithmetic number, because the mean of its divisors is an integer number (155681911143).

Almost surely, 2^621062597021 is an apocalyptic number.

It is an amenable number.

621062597021 is a deficient number, since it is larger than the sum of its proper divisors (1665047551).

621062597021 is a wasteful number, since it uses less digits than its factorization.

621062597021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665047550.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 621062597021 in words is "six hundred twenty-one billion, sixty-two million, five hundred ninety-seven thousand, twenty-one".