21463322661 has 24 divisors (see below), whose sum is σ = 33847074144. Its totient is φ = 12998043360.

The previous prime is 21463322623. The next prime is 21463322663. The reversal of 21463322661 is 16622336412.

21463322661 is a `hidden beast` number, since 2 + 14 + 633 + 2 + 2 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 21463322661 - 2³⁰ = 20389580837 is a prime.

It is a super-2 number, since 2×21463322661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21463322663) 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, 46455 + ... + 212331.

It is an arithmetic number, because the mean of its divisors is an integer number (1410294756).

Almost surely, 2^21463322661 is an apocalyptic number.

It is an amenable number.

21463322661 is a deficient number, since it is larger than the sum of its proper divisors (12383751483).

21463322661 is a wasteful number, since it uses less digits than its factorization.

21463322661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167201 (or 167198 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The spelling of 21463322661 in words is "twenty-one billion, four hundred sixty-three million, three hundred twenty-two thousand, six hundred sixty-one".