1111220001 has 24 divisors (see below), whose sum is σ = 1658091240. Its totient is φ = 716587776.

The previous prime is 1111219987. The next prime is 1111220009. The reversal of 1111220001 is 1000221111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 746600976 + 364619025 = 27324^2 + 19095^2 .

It is not a de Polignac number, because 1111220001 - 2⁵ = 1111219969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1111220009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47965 + ... + 67253.

It is an arithmetic number, because the mean of its divisors is an integer number (69087135).

Almost surely, 2^1111220001 is an apocalyptic number.

It is an amenable number.

1111220001 is a deficient number, since it is larger than the sum of its proper divisors (546871239).

1111220001 is a wasteful number, since it uses less digits than its factorization.

1111220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19505 (or 19502 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1111220001 is about 33334.9666416512. The cubic root of 1111220001 is about 1035.7780021663.

Adding to 1111220001 its reverse (1000221111), we get a palindrome (2111441112).

It can be divided in two parts, 11112 and 20001, that added together give a palindrome (31113).

The spelling of 1111220001 in words is "one billion, one hundred eleven million, two hundred twenty thousand, one".