16213219685 has 32 divisors (see below), whose sum is σ = 23149566720. Its totient is φ = 10778600448.

The previous prime is 16213219681. The next prime is 16213219717. The reversal of 16213219685 is 58691231261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16213219685 - 2² = 16213219681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16213219681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293555 + ... + 344384.

It is an arithmetic number, because the mean of its divisors is an integer number (723423960).

Almost surely, 2^16213219685 is an apocalyptic number.

It is an amenable number.

16213219685 is a deficient number, since it is larger than the sum of its proper divisors (6936347035).

16213219685 is a wasteful number, since it uses less digits than its factorization.

16213219685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637997.

The product of its digits is 155520, while the sum is 44.

The spelling of 16213219685 in words is "sixteen billion, two hundred thirteen million, two hundred nineteen thousand, six hundred eighty-five".