21265092099 has 12 divisors (see below), whose sum is σ = 31105058400. Its totient is φ = 13997275344.

The previous prime is 21265092059. The next prime is 21265092113. The reversal of 21265092099 is 99029056212.

It is not a de Polignac number, because 21265092099 - 2¹³ = 21265083907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21265092019) 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, 14953644 + ... + 14955065.

It is an arithmetic number, because the mean of its divisors is an integer number (2592088200).

Almost surely, 2^21265092099 is an apocalyptic number.

21265092099 is a deficient number, since it is larger than the sum of its proper divisors (9839966301).

21265092099 is a wasteful number, since it uses less digits than its factorization.

21265092099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29908794 (or 29908791 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 21265092099 in words is "twenty-one billion, two hundred sixty-five million, ninety-two thousand, ninety-nine".