21617221701 has 8 divisors (see below), whose sum is σ = 28830146464. Its totient is φ = 14407889040.

The previous prime is 21617221697. The next prime is 21617221727. The reversal of 21617221701 is 10712271612.

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

It is not a de Polignac number, because 21617221701 - 2² = 21617221697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21617221771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883951 + ... + 908076.

It is an arithmetic number, because the mean of its divisors is an integer number (3603768308).

Almost surely, 2^21617221701 is an apocalyptic number.

It is an amenable number.

21617221701 is a deficient number, since it is larger than the sum of its proper divisors (7212924763).

21617221701 is a wasteful number, since it uses less digits than its factorization.

21617221701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796051.

The product of its (nonzero) digits is 2352, while the sum is 30.

The spelling of 21617221701 in words is "twenty-one billion, six hundred seventeen million, two hundred twenty-one thousand, seven hundred one".