212021002191 has 16 divisors (see below), whose sum is σ = 288826481664. Its totient is φ = 138283867104.

The previous prime is 212021002187. The next prime is 212021002211. The reversal of 212021002191 is 191200120212.

It is not a de Polignac number, because 212021002191 - 2² = 212021002187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021002121) 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, 45726 + ... + 652788.

It is an arithmetic number, because the mean of its divisors is an integer number (18051655104).

Almost surely, 2^212021002191 is an apocalyptic number.

212021002191 is a deficient number, since it is larger than the sum of its proper divisors (76805479473).

212021002191 is a wasteful number, since it uses less digits than its factorization.

212021002191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609590.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 212021002191 in words is "two hundred twelve billion, twenty-one million, two thousand, one hundred ninety-one".