217365900123 has 16 divisors (see below), whose sum is σ = 307642505760. Its totient is φ = 136042891776.

The previous prime is 217365900083. The next prime is 217365900131. The reversal of 217365900123 is 321009563712.

It is a happy number.

It is not a de Polignac number, because 217365900123 - 2²⁵ = 217332345691 is a prime.

It is a super-2 number, since 2×217365900123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217365900623) 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, 5347608 + ... + 5388101.

It is an arithmetic number, because the mean of its divisors is an integer number (19227656610).

Almost surely, 2^217365900123 is an apocalyptic number.

217365900123 is a deficient number, since it is larger than the sum of its proper divisors (90276605637).

217365900123 is a wasteful number, since it uses less digits than its factorization.

217365900123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736126.

The product of its (nonzero) digits is 68040, while the sum is 39.

The spelling of 217365900123 in words is "two hundred seventeen billion, three hundred sixty-five million, nine hundred thousand, one hundred twenty-three".