621721206113 has 8 divisors (see below), whose sum is σ = 710543723328. Its totient is φ = 532899989424.

The previous prime is 621721206107. The next prime is 621721206133. The reversal of 621721206113 is 311602127126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621721206113 - 2⁴ = 621721206097 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 621721206113.

It is not an unprimeable number, because it can be changed into a prime (621721206133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1138595 + ... + 1593687.

It is an arithmetic number, because the mean of its divisors is an integer number (88817965416).

Almost surely, 2^621721206113 is an apocalyptic number.

It is an amenable number.

621721206113 is a deficient number, since it is larger than the sum of its proper divisors (88822517215).

621721206113 is a wasteful number, since it uses less digits than its factorization.

621721206113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650263.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 621721206113 in words is "six hundred twenty-one billion, seven hundred twenty-one million, two hundred six thousand, one hundred thirteen".