21415012109 has 16 divisors (see below), whose sum is σ = 22716080640. Its totient is φ = 20147529600.

The previous prime is 21415012067. The next prime is 21415012127. The reversal of 21415012109 is 90121051412.

It is a cyclic number.

It is not a de Polignac number, because 21415012109 - 2²⁰ = 21413963533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415012139) 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, 312284 + ... + 374634.

It is an arithmetic number, because the mean of its divisors is an integer number (1419755040).

Almost surely, 2^21415012109 is an apocalyptic number.

It is an amenable number.

21415012109 is a deficient number, since it is larger than the sum of its proper divisors (1301068531).

21415012109 is a wasteful number, since it uses less digits than its factorization.

21415012109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62620.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 21415012109 in words is "twenty-one billion, four hundred fifteen million, twelve thousand, one hundred nine".