91020020212201 has 4 divisors (see below), whose sum is σ = 91021027484304. Its totient is φ = 91019012940100.

The previous prime is 91020020212193. The next prime is 91020020212211. The reversal of 91020020212201 is 10221202002019.

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 91020020212201 - 2³ = 91020020212193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91020020212211) 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, 503500495 + ... + 503681236.

It is an arithmetic number, because the mean of its divisors is an integer number (22755256871076).

Almost surely, 2^{91020020212201} is an apocalyptic number.

It is an amenable number.

91020020212201 is a deficient number, since it is larger than the sum of its proper divisors (1007272103).

91020020212201 is a wasteful number, since it uses less digits than its factorization.

91020020212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007272102.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 91020020212201 in words is "ninety-one trillion, twenty billion, twenty million, two hundred twelve thousand, two hundred one".