999012121021 has 8 divisors (see below), whose sum is σ = 1020901875840. Its totient is φ = 977148790368.

The previous prime is 999012120991. The next prime is 999012121039. The reversal of 999012121021 is 120121210999.

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 999012121021 - 2²⁹ = 998475250109 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 (999012124021) 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, 6529591 + ... + 6680836.

It is an arithmetic number, because the mean of its divisors is an integer number (127612734480).

Almost surely, 2^999012121021 is an apocalyptic number.

It is an amenable number.

999012121021 is a deficient number, since it is larger than the sum of its proper divisors (21889754819).

999012121021 is a wasteful number, since it uses less digits than its factorization.

999012121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13212083.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 999012121021 in words is "nine hundred ninety-nine billion, twelve million, one hundred twenty-one thousand, twenty-one".