21122500621 has 8 divisors (see below), whose sum is σ = 22259992320. Its totient is φ = 19987587072.

The previous prime is 21122500589. The next prime is 21122500661. The reversal of 21122500621 is 12600522112.

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 21122500621 - 2⁵ = 21122500589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122500592 and 21122500601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122500661) 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, 627700 + ... + 660493.

It is an arithmetic number, because the mean of its divisors is an integer number (2782499040).

Almost surely, 2^21122500621 is an apocalyptic number.

It is an amenable number.

21122500621 is a deficient number, since it is larger than the sum of its proper divisors (1137491699).

21122500621 is a wasteful number, since it uses less digits than its factorization.

21122500621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289075.

The product of its (nonzero) digits is 480, while the sum is 22.

The spelling of 21122500621 in words is "twenty-one billion, one hundred twenty-two million, five hundred thousand, six hundred twenty-one".