21452015015 has 16 divisors (see below), whose sum is σ = 26974080000. Its totient is φ = 16346750112.

The previous prime is 21452014981. The next prime is 21452015023. The reversal of 21452015015 is 51051025412.

It is a cyclic number.

It is not a de Polignac number, because 21452015015 - 2¹⁰ = 21452013991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362765 + ... + 417734.

It is an arithmetic number, because the mean of its divisors is an integer number (1685880000).

Almost surely, 2^21452015015 is an apocalyptic number.

21452015015 is a deficient number, since it is larger than the sum of its proper divisors (5522064985).

21452015015 is a wasteful number, since it uses less digits than its factorization.

21452015015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780766.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 21452015015 in words is "twenty-one billion, four hundred fifty-two million, fifteen thousand, fifteen".