21152515366223 has 16 divisors (see below), whose sum is σ = 21702168444960. Its totient is φ = 20609246601216.

The previous prime is 21152515366159. The next prime is 21152515366247. The reversal of 21152515366223 is 32266351525112.

It is a cyclic number.

It is not a de Polignac number, because 21152515366223 - 2⁶ = 21152515366159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152515363223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348233711 + ... + 348294447.

It is an arithmetic number, because the mean of its divisors is an integer number (1356385527810).

Almost surely, 2^{21152515366223} is an apocalyptic number.

21152515366223 is a deficient number, since it is larger than the sum of its proper divisors (549653078737).

21152515366223 is a wasteful number, since it uses less digits than its factorization.

21152515366223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113146.

The product of its digits is 648000, while the sum is 44.

The spelling of 21152515366223 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, three hundred sixty-six thousand, two hundred twenty-three".