21451241012115 has 64 divisors (see below), whose sum is σ = 38303383939200. Its totient is φ = 10200224047104.

The previous prime is 21451241012099. The next prime is 21451241012137. The reversal of 21451241012115 is 51121014215412.

It is a happy number.

It is not a de Polignac number, because 21451241012115 - 2⁴ = 21451241012099 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, 26973880 + ... + 27757749.

It is an arithmetic number, because the mean of its divisors is an integer number (598490374050).

Almost surely, 2^{21451241012115} is an apocalyptic number.

21451241012115 is a deficient number, since it is larger than the sum of its proper divisors (16852142927085).

21451241012115 is a wasteful number, since it uses less digits than its factorization.

21451241012115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54731736.

The product of its (nonzero) digits is 3200, while the sum is 30.

Adding to 21451241012115 its reverse (51121014215412), we get a palindrome (72572255227527).

The spelling of 21451241012115 in words is "twenty-one trillion, four hundred fifty-one billion, two hundred forty-one million, twelve thousand, one hundred fifteen".