1111221101021 has 4 divisors (see below), whose sum is σ = 1129437840444. Its totient is φ = 1093004361600.

The previous prime is 1111221101017. The next prime is 1111221101027. The reversal of 1111221101021 is 1201011221111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 144707964025 + 966513136996 = 380405^2 + 983114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111221101021 - 2² = 1111221101017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111221100987 and 1111221101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111221101027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9108369620 + ... + 9108369741.

It is an arithmetic number, because the mean of its divisors is an integer number (282359460111).

Almost surely, 2^{1111221101021} is an apocalyptic number.

It is an amenable number.

1111221101021 is a deficient number, since it is larger than the sum of its proper divisors (18216739423).

1111221101021 is an equidigital number, since it uses as much as digits as its factorization.

1111221101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18216739422.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1111221101021 its reverse (1201011221111), we get a palindrome (2312232322132).

The spelling of 1111221101021 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred one thousand, twenty-one".