191220212 has 12 divisors (see below), whose sum is σ = 335549760. Its totient is φ = 95348856.

The previous prime is 191220167. The next prime is 191220247. The reversal of 191220212 is 212022191.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63662 + ... + 66597.

It is an arithmetic number, because the mean of its divisors is an integer number (27962480).

Almost surely, 2^191220212 is an apocalyptic number.

It is an amenable number.

191220212 is a deficient number, since it is larger than the sum of its proper divisors (144329548).

191220212 is a wasteful number, since it uses less digits than its factorization.

191220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130630 (or 130628 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 191220212 is about 13828.2396565868. The cubic root of 191220212 is about 576.1177622197.

The spelling of 191220212 in words is "one hundred ninety-one million, two hundred twenty thousand, two hundred twelve".