21052250015 has 8 divisors (see below), whose sum is σ = 25546551120. Its totient is φ = 16652565952.

The previous prime is 21052249997. The next prime is 21052250057. The reversal of 21052250015 is 51005225012.

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 21052250015 - 2¹⁸ = 21051987871 is a prime.

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, 23653769 + ... + 23654658.

It is an arithmetic number, because the mean of its divisors is an integer number (3193318890).

Almost surely, 2^21052250015 is an apocalyptic number.

21052250015 is a deficient number, since it is larger than the sum of its proper divisors (4494301105).

21052250015 is an equidigital number, since it uses as much as digits as its factorization.

21052250015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47308521.

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 21052250015 its reverse (51005225012), we get a palindrome (72057475027).

The spelling of 21052250015 in words is "twenty-one billion, fifty-two million, two hundred fifty thousand, fifteen".