212120099 has 16 divisors (see below), whose sum is σ = 225607680. Its totient is φ = 199029600.

The previous prime is 212120093. The next prime is 212120107. The reversal of 212120099 is 990021212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212120099 - 2²⁴ = 195342883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212120093) 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, 294662 + ... + 295380.

It is an arithmetic number, because the mean of its divisors is an integer number (14100480).

Almost surely, 2^212120099 is an apocalyptic number.

212120099 is a deficient number, since it is larger than the sum of its proper divisors (13487581).

212120099 is a wasteful number, since it uses less digits than its factorization.

212120099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 212120099 is about 14564.3434112218. The cubic root of 212120099 is about 596.3857717114.

The spelling of 212120099 in words is "two hundred twelve million, one hundred twenty thousand, ninety-nine".