21106285715 has 8 divisors (see below), whose sum is σ = 25328502528. Its totient is φ = 16884388800.

The previous prime is 21106285703. The next prime is 21106285721. The reversal of 21106285715 is 51758260112.

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

It is not a de Polignac number, because 21106285715 - 2⁴ = 21106285699 is a prime.

It is a super-2 number, since 2×21106285715² (a number of 21 digits) contains 22 as substring.

It is a Duffinian 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, 103415 + ... + 230015.

It is an arithmetic number, because the mean of its divisors is an integer number (3166062816).

Almost surely, 2^21106285715 is an apocalyptic number.

21106285715 is a deficient number, since it is larger than the sum of its proper divisors (4222216813).

21106285715 is a wasteful number, since it uses less digits than its factorization.

21106285715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159949.

The product of its (nonzero) digits is 33600, while the sum is 38.

The spelling of 21106285715 in words is "twenty-one billion, one hundred six million, two hundred eighty-five thousand, seven hundred fifteen".