21346687692 has 36 divisors (see below), whose sum is σ = 58865109576. Its totient is φ = 6468693120.

The previous prime is 21346687657. The next prime is 21346687697. The reversal of 21346687692 is 29678664312.

21346687692 is a `hidden beast` number, since 2 + 13 + 466 + 87 + 6 + 92 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21346687697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26952493 + ... + 26953284.

Almost surely, 2^21346687692 is an apocalyptic number.

21346687692 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21346687692 is an abundant number, since it is smaller than the sum of its proper divisors (37518421884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21346687692 is a wasteful number, since it uses less digits than its factorization.

21346687692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53905798 (or 53905793 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 21346687692 in words is "twenty-one billion, three hundred forty-six million, six hundred eighty-seven thousand, six hundred ninety-two".