21102026449 has 20 divisors (see below), whose sum is σ = 25913283440. Its totient is φ = 17135443080.

The previous prime is 21102026333. The next prime is 21102026459. The reversal of 21102026449 is 94462020112.

It is not a de Polignac number, because 21102026449 - 2²⁹ = 20565155537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102026449.

It is not an unprimeable number, because it can be changed into a prime (21102026459) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185667 + ... + 276904.

It is an arithmetic number, because the mean of its divisors is an integer number (1295664172).

Almost surely, 2^21102026449 is an apocalyptic number.

It is an amenable number.

21102026449 is a deficient number, since it is larger than the sum of its proper divisors (4811256991).

21102026449 is an frugal number, since it uses more digits than its factorization.

21102026449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462618 (or 462597 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 21102026449 in words is "twenty-one billion, one hundred two million, twenty-six thousand, four hundred forty-nine".