212102100091 has 32 divisors (see below), whose sum is σ = 261305948160. Its totient is φ = 168017740800.

The previous prime is 212102100061. The next prime is 212102100139. The reversal of 212102100091 is 190001201212.

It is a happy number.

It is not a de Polignac number, because 212102100091 - 2¹³ = 212102091899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212102100061) 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, 6379551 + ... + 6412711.

It is an arithmetic number, because the mean of its divisors is an integer number (8165810880).

Almost surely, 2^212102100091 is an apocalyptic number.

212102100091 is a deficient number, since it is larger than the sum of its proper divisors (49203848069).

212102100091 is a wasteful number, since it uses less digits than its factorization.

212102100091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34155.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 212102100091 in words is "two hundred twelve billion, one hundred two million, one hundred thousand, ninety-one".