99221431 has 4 divisors (see below), whose sum is σ = 99398232. Its totient is φ = 99044632.

The previous prime is 99221429. The next prime is 99221443. The reversal of 99221431 is 13412299.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99221431 - 2¹ = 99221429 is a prime.

It is a super-2 number, since 2×99221431² = 19689784739375522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99221393 and 99221402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99221461) 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, 87556 + ... + 88681.

It is an arithmetic number, because the mean of its divisors is an integer number (24849558).

Almost surely, 2^99221431 is an apocalyptic number.

99221431 is a deficient number, since it is larger than the sum of its proper divisors (176801).

99221431 is a wasteful number, since it uses less digits than its factorization.

99221431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176800.

The product of its digits is 3888, while the sum is 31.

The square root of 99221431 is about 9960.9954823803. The cubic root of 99221431 is about 462.9511444981.

The spelling of 99221431 in words is "ninety-nine million, two hundred twenty-one thousand, four hundred thirty-one".