91201212100211 has 4 divisors (see below), whose sum is σ = 91201241324424. Its totient is φ = 91201182876000.

The previous prime is 91201212100189. The next prime is 91201212100277. The reversal of 91201212100211 is 11200121210219.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91201212100211 - 2⁶ = 91201212100147 is a prime.

It is a super-2 number, since 2×91201212100211² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91201212100811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9283190 + ... + 16388411.

It is an arithmetic number, because the mean of its divisors is an integer number (22800310331106).

Almost surely, 2^{91201212100211} is an apocalyptic number.

91201212100211 is a deficient number, since it is larger than the sum of its proper divisors (29224213).

91201212100211 is a wasteful number, since it uses less digits than its factorization.

91201212100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29224212.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 91201212100211 in words is "ninety-one trillion, two hundred one billion, two hundred twelve million, one hundred thousand, two hundred eleven".