99001421 has 8 divisors (see below), whose sum is σ = 104933304. Its totient is φ = 93081600.

The previous prime is 99001417. The next prime is 99001423. The reversal of 99001421 is 12410099.

It can be written as a sum of positive squares in 4 ways, for example, as 8008900 + 90992521 = 2830^2 + 9539^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 99001421 - 2² = 99001417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99001423) 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, 18221 + ... + 23021.

It is an arithmetic number, because the mean of its divisors is an integer number (13116663).

Almost surely, 2^99001421 is an apocalyptic number.

It is an amenable number.

99001421 is a deficient number, since it is larger than the sum of its proper divisors (5931883).

99001421 is a wasteful number, since it uses less digits than its factorization.

99001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6031.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 99001421 is about 9949.9457787467. The cubic root of 99001421 is about 462.6087142539.

The spelling of 99001421 in words is "ninety-nine million, one thousand, four hundred twenty-one".