91234021 has 4 divisors (see below), whose sum is σ = 91270432. Its totient is φ = 91197612.

The previous prime is 91234009. The next prime is 91234051. The reversal of 91234021 is 12043219.

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 91234021 - 2¹³ = 91225829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91233983 and 91234001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91234051) 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, 14145 + ... + 19558.

It is an arithmetic number, because the mean of its divisors is an integer number (22817608).

Almost surely, 2^91234021 is an apocalyptic number.

It is an amenable number.

91234021 is a deficient number, since it is larger than the sum of its proper divisors (36411).

91234021 is a wasteful number, since it uses less digits than its factorization.

91234021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36410.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 91234021 is about 9551.6501715672. The cubic root of 91234021 is about 450.1793869163.

The spelling of 91234021 in words is "ninety-one million, two hundred thirty-four thousand, twenty-one".