21436465515 has 16 divisors (see below), whose sum is σ = 34301810688. Its totient is φ = 11431626336.

The previous prime is 21436465481. The next prime is 21436465577. The reversal of 21436465515 is 51556463412.

It is not a de Polignac number, because 21436465515 - 2¹³ = 21436457323 is a prime.

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, 93444 + ... + 227166.

It is an arithmetic number, because the mean of its divisors is an integer number (2143863168).

Almost surely, 2^21436465515 is an apocalyptic number.

21436465515 is a deficient number, since it is larger than the sum of its proper divisors (12865345173).

21436465515 is a wasteful number, since it uses less digits than its factorization.

21436465515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144418.

The product of its digits is 432000, while the sum is 42.

The spelling of 21436465515 in words is "twenty-one billion, four hundred thirty-six million, four hundred sixty-five thousand, five hundred fifteen".