21352660461 has 24 divisors (see below), whose sum is σ = 33944391936. Its totient is φ = 12826477440.

The previous prime is 21352660411. The next prime is 21352660463. The reversal of 21352660461 is 16406625312.

21352660461 is a `hidden beast` number, since 2 + 13 + 526 + 60 + 4 + 61 = 666.

It is not a de Polignac number, because 21352660461 - 2²² = 21348466157 is a prime.

It is a super-2 number, since 2×21352660461² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352660463) 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, 943165 + ... + 965538.

It is an arithmetic number, because the mean of its divisors is an integer number (1414349664).

Almost surely, 2^21352660461 is an apocalyptic number.

It is an amenable number.

21352660461 is a deficient number, since it is larger than the sum of its proper divisors (12591731475).

21352660461 is a wasteful number, since it uses less digits than its factorization.

21352660461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908833 (or 1908830 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 21352660461 in words is "twenty-one billion, three hundred fifty-two million, six hundred sixty thousand, four hundred sixty-one".