1011021220999 has 8 divisors (see below), whose sum is σ = 1022228407872. Its totient is φ = 999837506400.

The previous prime is 1011021220973. The next prime is 1011021221003. The reversal of 1011021220999 is 9990221201101.

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 1011021220999 - 2¹⁷ = 1011021089927 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 (1011021220939) 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, 5781439 + ... + 5953744.

It is an arithmetic number, because the mean of its divisors is an integer number (127778550984).

Almost surely, 2^{1011021220999} is an apocalyptic number.

1011021220999 is a deficient number, since it is larger than the sum of its proper divisors (11207186873).

1011021220999 is a wasteful number, since it uses less digits than its factorization.

1011021220999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736137.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 1011021220999 in words is "one trillion, eleven billion, twenty-one million, two hundred twenty thousand, nine hundred ninety-nine".