999121111020101 has 8 divisors (see below), whose sum is σ = 1007135578573824. Its totient is φ = 991108946157120.

The previous prime is 999121111020059. The next prime is 999121111020209. The reversal of 999121111020101 is 101020111121999.

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 999121111020101 - 2³⁴ = 999103931150917 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 (999121111029101) 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, 574801415 + ... + 576536996.

It is an arithmetic number, because the mean of its divisors is an integer number (125891947321728).

Almost surely, 2^{999121111020101} is an apocalyptic number.

It is an amenable number.

999121111020101 is a deficient number, since it is larger than the sum of its proper divisors (8014467553723).

999121111020101 is a wasteful number, since it uses less digits than its factorization.

999121111020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151345371.

The product of its (nonzero) digits is 2916, while the sum is 38.

The spelling of 999121111020101 in words is "nine hundred ninety-nine trillion, one hundred twenty-one billion, one hundred eleven million, twenty thousand, one hundred one".