1021001211999 has 6 divisors (see below), whose sum is σ = 1474779528456. Its totient is φ = 680667474660.

The previous prime is 1021001211961. The next prime is 1021001212001. The reversal of 1021001211999 is 9991121001201.

It is not a de Polignac number, because 1021001211999 - 2⁸ = 1021001211743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021001211499) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56722289547 + ... + 56722289564.

It is an arithmetic number, because the mean of its divisors is an integer number (245796588076).

Almost surely, 2^{1021001211999} is an apocalyptic number.

1021001211999 is a deficient number, since it is larger than the sum of its proper divisors (453778316457).

1021001211999 is a wasteful number, since it uses less digits than its factorization.

1021001211999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113444579117 (or 113444579114 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 36.

The spelling of 1021001211999 in words is "one trillion, twenty-one billion, one million, two hundred eleven thousand, nine hundred ninety-nine".