1011121220999 has 4 divisors (see below), whose sum is σ = 1011795753000. Its totient is φ = 1010446689000.

The previous prime is 1011121220929. The next prime is 1011121221013. The reversal of 1011121220999 is 9990221211101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011121220999 is a prime.

It is a super-2 number, since 2×1011121220999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011121220929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337263752 + ... + 337266749.

It is an arithmetic number, because the mean of its divisors is an integer number (252948938250).

Almost surely, 2^{1011121220999} is an apocalyptic number.

1011121220999 is a deficient number, since it is larger than the sum of its proper divisors (674532001).

1011121220999 is an equidigital number, since it uses as much as digits as its factorization.

1011121220999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674532000.

The product of its (nonzero) digits is 5832, while the sum is 38.

The spelling of 1011121220999 in words is "one trillion, eleven billion, one hundred twenty-one million, two hundred twenty thousand, nine hundred ninety-nine".