91200012221 has 8 divisors (see below), whose sum is σ = 92761856640. Its totient is φ = 89638703968.

The previous prime is 91200012193. The next prime is 91200012223. The reversal of 91200012221 is 12221000219.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91200012221 - 2⁶ = 91200012157 is a prime.

It is a super-2 number, since 2×91200012221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91200012193 and 91200012202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91200012223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216860 + ... + 478986.

It is an arithmetic number, because the mean of its divisors is an integer number (11595232080).

Almost surely, 2^91200012221 is an apocalyptic number.

It is an amenable number.

91200012221 is a deficient number, since it is larger than the sum of its proper divisors (1561844419).

91200012221 is a wasteful number, since it uses less digits than its factorization.

91200012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268083.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 91200012221 in words is "ninety-one billion, two hundred million, twelve thousand, two hundred twenty-one".