21652621641 has 24 divisors (see below), whose sum is σ = 35755125120. Its totient is φ = 12369079296.

The previous prime is 21652621631. The next prime is 21652621687. The reversal of 21652621641 is 14612625612.

21652621641 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 2 + 6 + 2 + 1 + 641 = 666.

It is not a de Polignac number, because 21652621641 - 2⁵ = 21652621609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21652621596 and 21652621605.

It is not an unprimeable number, because it can be changed into a prime (21652621631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157321 + ... + 260873.

It is an arithmetic number, because the mean of its divisors is an integer number (1489796880).

Almost surely, 2^21652621641 is an apocalyptic number.

21652621641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21652621641 is a deficient number, since it is larger than the sum of its proper divisors (14102503479).

21652621641 is a wasteful number, since it uses less digits than its factorization.

21652621641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106885 (or 106882 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 21652621641 in words is "twenty-one billion, six hundred fifty-two million, six hundred twenty-one thousand, six hundred forty-one".