215028732123 has 12 divisors (see below), whose sum is σ = 311885845128. Its totient is φ = 142757663040.

The previous prime is 215028732119. The next prime is 215028732131. The reversal of 215028732123 is 321237820512.

215028732123 is a `hidden beast` number, since 2 + 1 + 50 + 287 + 321 + 2 + 3 = 666.

It is not a de Polignac number, because 215028732123 - 2² = 215028732119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215028732173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49566465 + ... + 49570802.

It is an arithmetic number, because the mean of its divisors is an integer number (25990487094).

Almost surely, 2^215028732123 is an apocalyptic number.

215028732123 is a deficient number, since it is larger than the sum of its proper divisors (96857113005).

215028732123 is a wasteful number, since it uses less digits than its factorization.

215028732123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99137514 (or 99137511 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 215028732123 in words is "two hundred fifteen billion, twenty-eight million, seven hundred thirty-two thousand, one hundred twenty-three".