999421121 has 4 divisors (see below), whose sum is σ = 1031660544. Its totient is φ = 967181700.

The previous prime is 999421103. The next prime is 999421141. The reversal of 999421121 is 121124999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 999421121 - 2⁶ = 999421057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999421141) 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, 16119665 + ... + 16119726.

It is an arithmetic number, because the mean of its divisors is an integer number (257915136).

Almost surely, 2^999421121 is an apocalyptic number.

It is an amenable number.

999421121 is a deficient number, since it is larger than the sum of its proper divisors (32239423).

999421121 is a wasteful number, since it uses less digits than its factorization.

999421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32239422.

The product of its digits is 11664, while the sum is 38.

The square root of 999421121 is about 31613.6223960495. The cubic root of 999421121 is about 999.8070030879.

The spelling of 999421121 in words is "nine hundred ninety-nine million, four hundred twenty-one thousand, one hundred twenty-one".