21361415515 has 64 divisors (see below), whose sum is σ = 29730032640. Its totient is φ = 14587292160.

The previous prime is 21361415507. The next prime is 21361415533. The reversal of 21361415515 is 51551416312.

It is not a de Polignac number, because 21361415515 - 2³ = 21361415507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20094874 + ... + 20095936.

It is an arithmetic number, because the mean of its divisors is an integer number (464531760).

Almost surely, 2^21361415515 is an apocalyptic number.

21361415515 is a deficient number, since it is larger than the sum of its proper divisors (8368617125).

21361415515 is a wasteful number, since it uses less digits than its factorization.

21361415515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444.

The product of its digits is 18000, while the sum is 34.

The spelling of 21361415515 in words is "twenty-one billion, three hundred sixty-one million, four hundred fifteen thousand, five hundred fifteen".