21621401720107 has 8 divisors (see below), whose sum is σ = 24710489841632. Its totient is φ = 18532392710400.

The previous prime is 21621401720033. The next prime is 21621401720143. The reversal of 21621401720107 is 70102710412612.

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 21621401720107 - 2¹⁵ = 21621401687339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21621401720207) 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, 19191144 + ... + 20286517.

It is an arithmetic number, because the mean of its divisors is an integer number (3088811230204).

Almost surely, 2^{21621401720107} is an apocalyptic number.

21621401720107 is a deficient number, since it is larger than the sum of its proper divisors (3089088121525).

21621401720107 is an equidigital number, since it uses as much as digits as its factorization.

21621401720107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39555909.

The product of its (nonzero) digits is 9408, while the sum is 34.

The spelling of 21621401720107 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred one million, seven hundred twenty thousand, one hundred seven".