1200220011 has 24 divisors (see below), whose sum is σ = 1803647664. Its totient is φ = 797571360.

The previous prime is 1200220001. The next prime is 1200220031. The reversal of 1200220011 is 1100220021.

It is not a de Polignac number, because 1200220011 - 2⁶ = 1200219947 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1200219975 and 1200220002.

It is not an unprimeable number, because it can be changed into a prime (1200220001) 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, 69241 + ... + 84821.

It is an arithmetic number, because the mean of its divisors is an integer number (75151986).

Almost surely, 2^1200220011 is an apocalyptic number.

1200220011 is a deficient number, since it is larger than the sum of its proper divisors (603427653).

1200220011 is an equidigital number, since it uses as much as digits as its factorization.

1200220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15913 (or 15901 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200220011 is about 34644.1915910878. The cubic root of 1200220011 is about 1062.7235087070.

Adding to 1200220011 its reverse (1100220021), we get a palindrome (2300440032).

The spelling of 1200220011 in words is "one billion, two hundred million, two hundred twenty thousand, eleven".