21225332320515 has 24 divisors (see below), whose sum is σ = 36790725608208. Its totient is φ = 11320131211200.

The previous prime is 21225332320499. The next prime is 21225332320541. The reversal of 21225332320515 is 51502323352212.

21225332320515 is a `hidden beast` number, since 2 + 1 + 2 + 253 + 32 + 320 + 51 + 5 = 666.

It is not a de Polignac number, because 21225332320515 - 2⁴ = 21225332320499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21225332320515.

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, 12223240 + ... + 13851290.

It is an arithmetic number, because the mean of its divisors is an integer number (1532946900342).

Almost surely, 2^{21225332320515} is an apocalyptic number.

21225332320515 is a deficient number, since it is larger than the sum of its proper divisors (15565393287693).

21225332320515 is a wasteful number, since it uses less digits than its factorization.

21225332320515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917779 (or 1917776 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 21225332320515 its reverse (51502323352212), we get a palindrome (72727655672727).

The spelling of 21225332320515 in words is "twenty-one trillion, two hundred twenty-five billion, three hundred thirty-two million, three hundred twenty thousand, five hundred fifteen".