1121221222021 has 8 divisors (see below), whose sum is σ = 1122588149760. Its totient is φ = 1119854452752.

The previous prime is 1121221222003. The next prime is 1121221222039. The reversal of 1121221222021 is 1202221221211.

It is an interprime number because it is at equal distance from previous prime (1121221222003) and next prime (1121221222039).

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 1121221222021 - 2¹¹ = 1121221219973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121221222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121221222001) 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, 20523340 + ... + 20577898.

It is an arithmetic number, because the mean of its divisors is an integer number (140323518720).

Almost surely, 2^{1121221222021} is an apocalyptic number.

It is an amenable number.

1121221222021 is a deficient number, since it is larger than the sum of its proper divisors (1366927739).

1121221222021 is an equidigital number, since it uses as much as digits as its factorization.

1121221222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79235.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1121221222021 its reverse (1202221221211), we get a palindrome (2323442443232).

The spelling of 1121221222021 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty-one".