21675611021 has 8 divisors (see below), whose sum is σ = 21812172480. Its totient is φ = 21539221792.

The previous prime is 21675610981. The next prime is 21675611051. The reversal of 21675611021 is 12011657612.

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

It is not a de Polignac number, because 21675611021 - 2¹⁰ = 21675609997 is a prime.

It is a super-2 number, since 2×21675611021² (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 (21675611051) 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, 214256 + ... + 298758.

It is an arithmetic number, because the mean of its divisors is an integer number (2726521560).

Almost surely, 2^21675611021 is an apocalyptic number.

It is an amenable number.

21675611021 is a deficient number, since it is larger than the sum of its proper divisors (136561459).

21675611021 is a wasteful number, since it uses less digits than its factorization.

21675611021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86115.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 21675611021 in words is "twenty-one billion, six hundred seventy-five million, six hundred eleven thousand, twenty-one".