21623522055215 has 16 divisors (see below), whose sum is σ = 26873560304640. Its totient is φ = 16692296305440.

The previous prime is 21623522055193. The next prime is 21623522055221. The reversal of 21623522055215 is 51255022532612.

It is a happy number.

It is not a de Polignac number, because 21623522055215 - 2²² = 21623517860911 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, 647976185 + ... + 648009554.

It is an arithmetic number, because the mean of its divisors is an integer number (1679597519040).

Almost surely, 2^{21623522055215} is an apocalyptic number.

21623522055215 is a deficient number, since it is larger than the sum of its proper divisors (5250038249425).

21623522055215 is a wasteful number, since it uses less digits than its factorization.

21623522055215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295985862.

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 21623522055215 its reverse (51255022532612), we get a palindrome (72878544587827).

The spelling of 21623522055215 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-two million, fifty-five thousand, two hundred fifteen".