1111221001 has 16 divisors (see below), whose sum is σ = 1230225408. Its totient is φ = 995318800.

The previous prime is 1111220987. The next prime is 1111221017. The reversal of 1111221001 is 1001221111.

It is a cyclic number.

It is not a de Polignac number, because 1111221001 - 2⁹ = 1111220489 is a prime.

It is a super-2 number, since 2×1111221001² = 2469624226126884002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111221091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222336 + ... + 227278.

It is an arithmetic number, because the mean of its divisors is an integer number (76889088).

Almost surely, 2^1111221001 is an apocalyptic number.

1111221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111221001 is a deficient number, since it is larger than the sum of its proper divisors (119004407).

1111221001 is a wasteful number, since it uses less digits than its factorization.

1111221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1111221001 is about 33334.9816409129. The cubic root of 1111221001 is about 1035.7783128692.

Adding to 1111221001 its reverse (1001221111), we get a palindrome (2112442112).

The spelling of 1111221001 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one".