999121022 has 4 divisors (see below), whose sum is σ = 1498681536. Its totient is φ = 499560510.

The previous prime is 999120977. The next prime is 999121037. The reversal of 999121022 is 220121999.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 249780254 + ... + 249780257.

It is an arithmetic number, because the mean of its divisors is an integer number (374670384).

Almost surely, 2^999121022 is an apocalyptic number.

999121022 is a deficient number, since it is larger than the sum of its proper divisors (499560514).

999121022 is a wasteful number, since it uses less digits than its factorization.

999121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499560513.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 999121022 is about 31608.8756838961. The cubic root of 999121022 is about 999.7069214467.

It can be divided in two parts, 9991 and 21022, that added together give a palindrome (31013).

The spelling of 999121022 in words is "nine hundred ninety-nine million, one hundred twenty-one thousand, twenty-two".