21086227949 has 16 divisors (see below), whose sum is σ = 22296384000. Its totient is φ = 19886312880.

The previous prime is 21086227907. The next prime is 21086227973. The reversal of 21086227949 is 94972268012.

It is a cyclic number.

It is not a de Polignac number, because 21086227949 - 2²⁴ = 21069450733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21086227897 and 21086227906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086227999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4492694 + ... + 4497384.

It is an arithmetic number, because the mean of its divisors is an integer number (1393524000).

Almost surely, 2^21086227949 is an apocalyptic number.

It is an amenable number.

21086227949 is a deficient number, since it is larger than the sum of its proper divisors (1210156051).

21086227949 is a wasteful number, since it uses less digits than its factorization.

21086227949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 21086227949 in words is "twenty-one billion, eighty-six million, two hundred twenty-seven thousand, nine hundred forty-nine".