91021122112001 has 4 divisors (see below), whose sum is σ = 91023308742192. Its totient is φ = 91018935481812.

The previous prime is 91021122111977. The next prime is 91021122112073. The reversal of 91021122112001 is 10021122112019.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91021122112001 - 2¹⁰ = 91021122110977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91021122112201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093252655 + ... + 1093335908.

It is an arithmetic number, because the mean of its divisors is an integer number (22755827185548).

Almost surely, 2^{91021122112001} is an apocalyptic number.

It is an amenable number.

91021122112001 is a deficient number, since it is larger than the sum of its proper divisors (2186630191).

91021122112001 is a wasteful number, since it uses less digits than its factorization.

91021122112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186630190.

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

The spelling of 91021122112001 in words is "ninety-one trillion, twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, one".