21114602691 has 48 divisors (see below), whose sum is σ = 35427216384. Its totient is φ = 11087205696.

The previous prime is 21114602687. The next prime is 21114602699. The reversal of 21114602691 is 19620641112.

It is not a de Polignac number, because 21114602691 - 2² = 21114602687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21114602699) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 401380 + ... + 450926.

It is an arithmetic number, because the mean of its divisors is an integer number (738067008).

Almost surely, 2^21114602691 is an apocalyptic number.

21114602691 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21114602691 is a deficient number, since it is larger than the sum of its proper divisors (14312613693).

21114602691 is a wasteful number, since it uses less digits than its factorization.

21114602691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49800 (or 49793 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The spelling of 21114602691 in words is "twenty-one billion, one hundred fourteen million, six hundred two thousand, six hundred ninety-one".