1001222121999 has 32 divisors (see below), whose sum is σ = 1464321881088. Its totient is φ = 603475200000.

The previous prime is 1001222121979. The next prime is 1001222122003. The reversal of 1001222121999 is 9991212221001.

It is a happy number.

It is not a de Polignac number, because 1001222121999 - 2⁵ = 1001222121967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222121919) 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, 5888887 + ... + 6056519.

It is an arithmetic number, because the mean of its divisors is an integer number (45760058784).

Almost surely, 2^{1001222121999} is an apocalyptic number.

1001222121999 is a deficient number, since it is larger than the sum of its proper divisors (463099759089).

1001222121999 is a wasteful number, since it uses less digits than its factorization.

1001222121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168639.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 1001222121999 in words is "one trillion, one billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-nine".