21621628695 has 8 divisors (see below), whose sum is σ = 34594605936. Its totient is φ = 11531535296.

The previous prime is 21621628673. The next prime is 21621628729. The reversal of 21621628695 is 59682612612.

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 21621628695 - 2⁵ = 21621628663 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720720942 + ... + 720720971.

It is an arithmetic number, because the mean of its divisors is an integer number (4324325742).

Almost surely, 2^21621628695 is an apocalyptic number.

21621628695 is a deficient number, since it is larger than the sum of its proper divisors (12972977241).

21621628695 is a wasteful number, since it uses less digits than its factorization.

21621628695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441441921.

The product of its digits is 622080, while the sum is 48.

The spelling of 21621628695 in words is "twenty-one billion, six hundred twenty-one million, six hundred twenty-eight thousand, six hundred ninety-five".