1220002011 has 12 divisors (see below), whose sum is σ = 1778393760. Its totient is φ = 805872240.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220002011 is 1102000221.

It is not a de Polignac number, because 1220002011 - 2⁶ = 1220001947 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 = 1220001984 and 1220002002.

It is not an unprimeable number, because it can be changed into a prime (1220002019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 620835 + ... + 622796.

It is an arithmetic number, because the mean of its divisors is an integer number (148199480).

Almost surely, 2^1220002011 is an apocalyptic number.

1220002011 is a deficient number, since it is larger than the sum of its proper divisors (558391749).

1220002011 is a wasteful number, since it uses less digits than its factorization.

1220002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243746 (or 1243743 counting only the distinct ones).

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

The square root of 1220002011 is about 34928.5271805154. The cubic root of 1220002011 is about 1068.5303172560.

Adding to 1220002011 its reverse (1102000221), we get a palindrome (2322002232).

The spelling of 1220002011 in words is "one billion, two hundred twenty million, two thousand, eleven".