91214421 has 8 divisors (see below), whose sum is σ = 128020320. Its totient is φ = 57609072.

The previous prime is 91214399. The next prime is 91214429. The reversal of 91214421 is 12441219.

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

It is a de Polignac number, because none of the positive numbers 2^k-91214421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91214391 and 91214400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91214429) 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, 800070 + ... + 800183.

It is an arithmetic number, because the mean of its divisors is an integer number (16002540).

Almost surely, 2^91214421 is an apocalyptic number.

It is an amenable number.

91214421 is a deficient number, since it is larger than the sum of its proper divisors (36805899).

91214421 is a wasteful number, since it uses less digits than its factorization.

91214421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600275.

The product of its digits is 576, while the sum is 24.

The square root of 91214421 is about 9550.6241157319. The cubic root of 91214421 is about 450.1471469404.

The spelling of 91214421 in words is "ninety-one million, two hundred fourteen thousand, four hundred twenty-one".