99988121 has 8 divisors (see below), whose sum is σ = 101001600. Its totient is φ = 98979120.

The previous prime is 99988117. The next prime is 99988139. The reversal of 99988121 is 12188999.

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

It is not a de Polignac number, because 99988121 - 2² = 99988117 is a prime.

It is a super-2 number, since 2×99988121² = 19995248682221282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99984121) 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, 59075 + ... + 60743.

It is an arithmetic number, because the mean of its divisors is an integer number (12625200).

Almost surely, 2^99988121 is an apocalyptic number.

It is an amenable number.

99988121 is a deficient number, since it is larger than the sum of its proper divisors (1013479).

99988121 is a wasteful number, since it uses less digits than its factorization.

99988121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its digits is 93312, while the sum is 47.

The square root of 99988121 is about 9999.4060323601. The cubic root of 99988121 is about 464.1405034889.

The spelling of 99988121 in words is "ninety-nine million, nine hundred eighty-eight thousand, one hundred twenty-one".