999000021222 has 64 divisors (see below), whose sum is σ = 2567710978560. Its totient is φ = 281989670112.

The previous prime is 999000021203. The next prime is 999000021223. The reversal of 999000021222 is 222120000999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999000021223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15889453 + ... + 15952200.

It is an arithmetic number, because the mean of its divisors is an integer number (40120484040).

Almost surely, 2^999000021222 is an apocalyptic number.

999000021222 is an abundant number, since it is smaller than the sum of its proper divisors (1568710957338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999000021222 is a wasteful number, since it uses less digits than its factorization.

999000021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31841754 (or 31841748 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 999000021222 in words is "nine hundred ninety-nine billion, twenty-one thousand, two hundred twenty-two".