999012221012121 has 8 divisors (see below), whose sum is σ = 1339715810837760. Its totient is φ = 662158389263952.

The previous prime is 999012221012101. The next prime is 999012221012159. The reversal of 999012221012121 is 121210122210999.

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

It is not a de Polignac number, because 999012221012121 - 2²² = 999012216817817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999012221012101) 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, 962439518761 + ... + 962439519798.

It is an arithmetic number, because the mean of its divisors is an integer number (167464476354720).

Almost surely, 2^{999012221012121} is an apocalyptic number.

It is an amenable number.

999012221012121 is a deficient number, since it is larger than the sum of its proper divisors (340703589825639).

999012221012121 is a wasteful number, since it uses less digits than its factorization.

999012221012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924879038735.

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 999012221012121 in words is "nine hundred ninety-nine trillion, twelve billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".