21690676811 has 4 divisors (see below), whose sum is σ = 22832291400. Its totient is φ = 20549062224.

The previous prime is 21690676801. The next prime is 21690676841. The reversal of 21690676811 is 11867609612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21690676811 - 2⁶ = 21690676747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21690676801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570807266 + ... + 570807303.

It is an arithmetic number, because the mean of its divisors is an integer number (5708072850).

Almost surely, 2^21690676811 is an apocalyptic number.

21690676811 is a deficient number, since it is larger than the sum of its proper divisors (1141614589).

21690676811 is a wasteful number, since it uses less digits than its factorization.

21690676811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141614588.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 21690676811 in words is "twenty-one billion, six hundred ninety million, six hundred seventy-six thousand, eight hundred eleven".