21412535321515 has 24 divisors (see below), whose sum is σ = 27922642550208. Its totient is φ = 15756061950720.

The previous prime is 21412535321509. The next prime is 21412535321537. The reversal of 21412535321515 is 51512353521412.

It is not a de Polignac number, because 21412535321515 - 2²⁹ = 21411998450603 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44852019 + ... + 45326908.

It is an arithmetic number, because the mean of its divisors is an integer number (1163443439592).

Almost surely, 2^{21412535321515} is an apocalyptic number.

21412535321515 is a deficient number, since it is larger than the sum of its proper divisors (6510107228693).

21412535321515 is a wasteful number, since it uses less digits than its factorization.

21412535321515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90179239 (or 90179226 counting only the distinct ones).

The product of its digits is 180000, while the sum is 40.

Adding to 21412535321515 its reverse (51512353521412), we get a palindrome (72924888842927).

The spelling of 21412535321515 in words is "twenty-one trillion, four hundred twelve billion, five hundred thirty-five million, three hundred twenty-one thousand, five hundred fifteen".