621352500062521 has 4 divisors (see below), whose sum is σ = 621401762938852. Its totient is φ = 621303237186192.

The previous prime is 621352500062513. The next prime is 621352500062639. The reversal of 621352500062521 is 125260005253126.

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 455122019620921 + 166230480441600 = 21333589^2 + 12893040^2 .

It is a cyclic number.

It is not a de Polignac number, because 621352500062521 - 2³ = 621352500062513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621352500063521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24631419246 + ... + 24631444471.

It is an arithmetic number, because the mean of its divisors is an integer number (155350440734713).

Almost surely, 2^{621352500062521} is an apocalyptic number.

It is an amenable number.

621352500062521 is a deficient number, since it is larger than the sum of its proper divisors (49262876331).

621352500062521 is a wasteful number, since it uses less digits than its factorization.

621352500062521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49262876330.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 621352500062521 in words is "six hundred twenty-one trillion, three hundred fifty-two billion, five hundred million, sixty-two thousand, five hundred twenty-one".