91202421 has 8 divisors (see below), whose sum is σ = 121744480. Its totient is φ = 60730992.

The previous prime is 91202417. The next prime is 91202437. The reversal of 91202421 is 12420219.

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

It is not a de Polignac number, because 91202421 - 2² = 91202417 is a prime.

It is a super-2 number, since 2×91202421² = 16635763192522482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91202401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14566 + ... + 19863.

It is an arithmetic number, because the mean of its divisors is an integer number (15218060).

Almost surely, 2^91202421 is an apocalyptic number.

It is an amenable number.

91202421 is a deficient number, since it is larger than the sum of its proper divisors (30542059).

91202421 is a wasteful number, since it uses less digits than its factorization.

91202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35315.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 91202421 is about 9549.9958638734. The cubic root of 91202421 is about 450.1274059002.

The spelling of 91202421 in words is "ninety-one million, two hundred two thousand, four hundred twenty-one".