1111010001221 has 4 divisors (see below), whose sum is σ = 1111043178444. Its totient is φ = 1110976824000.

The previous prime is 1111010001217. The next prime is 1111010001259. The reversal of 1111010001221 is 1221000101111.

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 625500664996 + 485509336225 = 790886^2 + 696785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111010001221 - 2² = 1111010001217 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 (1111010001821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16538330 + ... + 16605371.

It is an arithmetic number, because the mean of its divisors is an integer number (277760794611).

Almost surely, 2^{1111010001221} is an apocalyptic number.

It is an amenable number.

1111010001221 is a deficient number, since it is larger than the sum of its proper divisors (33177223).

1111010001221 is an equidigital number, since it uses as much as digits as its factorization.

1111010001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33177222.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1111010001221 its reverse (1221000101111), we get a palindrome (2332010102332).

The spelling of 1111010001221 in words is "one trillion, one hundred eleven billion, ten million, one thousand, two hundred twenty-one".