21609960623 has 8 divisors (see below), whose sum is σ = 21735546480. Its totient is φ = 21484429120.

The previous prime is 21609960611. The next prime is 21609960649. The reversal of 21609960623 is 32606990612.

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 21609960623 - 2²⁰ = 21608912047 is a prime.

It is a super-2 number, since 2×21609960623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21609968623) 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, 1001933 + ... + 1023273.

It is an arithmetic number, because the mean of its divisors is an integer number (2716943310).

Almost surely, 2^21609960623 is an apocalyptic number.

21609960623 is a deficient number, since it is larger than the sum of its proper divisors (125585857).

21609960623 is a wasteful number, since it uses less digits than its factorization.

21609960623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27177.

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 21609960623 in words is "twenty-one billion, six hundred nine million, nine hundred sixty thousand, six hundred twenty-three".