213515015123 has 16 divisors (see below), whose sum is σ = 224601984000. Its totient is φ = 202691929440.

The previous prime is 213515015111. The next prime is 213515015137. The reversal of 213515015123 is 321510515312.

It is a cyclic number.

It is not a de Polignac number, because 213515015123 - 2¹⁶ = 213514949587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213515015183) 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, 14284988 + ... + 14299926.

It is an arithmetic number, because the mean of its divisors is an integer number (14037624000).

Almost surely, 2^213515015123 is an apocalyptic number.

213515015123 is a deficient number, since it is larger than the sum of its proper divisors (11086968877).

213515015123 is a wasteful number, since it uses less digits than its factorization.

213515015123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23722.

The product of its (nonzero) digits is 4500, while the sum is 29.

The spelling of 213515015123 in words is "two hundred thirteen billion, five hundred fifteen million, fifteen thousand, one hundred twenty-three".