21970113215 has 16 divisors (see below), whose sum is σ = 26810812128. Its totient is φ = 17279847936.

The previous prime is 21970113181. The next prime is 21970113223. The reversal of 21970113215 is 51231107912.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21970113215 - 2⁸ = 21970112959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18092 + ... + 210398.

It is an arithmetic number, because the mean of its divisors is an integer number (1675675758).

Almost surely, 2^21970113215 is an apocalyptic number.

21970113215 is a deficient number, since it is larger than the sum of its proper divisors (4840698913).

21970113215 is a wasteful number, since it uses less digits than its factorization.

21970113215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192698.

The product of its (nonzero) digits is 3780, while the sum is 32.

The spelling of 21970113215 in words is "twenty-one billion, nine hundred seventy million, one hundred thirteen thousand, two hundred fifteen".