21121322503615 has 8 divisors (see below), whose sum is σ = 25345782453600. Its totient is φ = 16896927703392.

The previous prime is 21121322503601. The next prime is 21121322503627. The reversal of 21121322503615 is 51630522312112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121322503615 - 2⁹ = 21121322503103 is a prime.

It is a super-2 number, since 2×21121322503615² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15571344 + ... + 16873333.

It is an arithmetic number, because the mean of its divisors is an integer number (3168222806700).

Almost surely, 2^{21121322503615} is an apocalyptic number.

21121322503615 is a deficient number, since it is larger than the sum of its proper divisors (4224459949985).

21121322503615 is a wasteful number, since it uses less digits than its factorization.

21121322503615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32574881.

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 21121322503615 its reverse (51630522312112), we get a palindrome (72751844815727).

The spelling of 21121322503615 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty-two million, five hundred three thousand, six hundred fifteen".