90211121 has 16 divisors (see below), whose sum is σ = 121123968. Its totient is φ = 64886400.

The previous prime is 90211103. The next prime is 90211153. The reversal of 90211121 is 12111209.

It is a cyclic number.

It is not a de Polignac number, because 90211121 - 2²⁶ = 23102257 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90211121.

It is not an unprimeable number, because it can be changed into a prime (90211171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44060 + ... + 46061.

It is an arithmetic number, because the mean of its divisors is an integer number (7570248).

Almost surely, 2^90211121 is an apocalyptic number.

90211121 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90211121 is a deficient number, since it is larger than the sum of its proper divisors (30912847).

90211121 is a wasteful number, since it uses less digits than its factorization.

90211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90152.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 90211121 is about 9497.9535164160. The cubic root of 90211121 is about 448.4906153283.

The spelling of 90211121 in words is "ninety million, two hundred eleven thousand, one hundred twenty-one".