21692680427 has 16 divisors (see below), whose sum is σ = 24631015680. Its totient is φ = 18923738400.

The previous prime is 21692680409. The next prime is 21692680439. The reversal of 21692680427 is 72408629612.

It is a cyclic number.

It is not a de Polignac number, because 21692680427 - 2¹⁴ = 21692664043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21692680027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156599 + ... + 260592.

It is an arithmetic number, because the mean of its divisors is an integer number (1539438480).

Almost surely, 2^21692680427 is an apocalyptic number.

21692680427 is a deficient number, since it is larger than the sum of its proper divisors (2938335253).

21692680427 is a wasteful number, since it uses less digits than its factorization.

21692680427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417394.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 21692680427 in words is "twenty-one billion, six hundred ninety-two million, six hundred eighty thousand, four hundred twenty-seven".