1201021011 has 6 divisors (see below), whose sum is σ = 1734808140. Its totient is φ = 800680668.

The previous prime is 1201021007. The next prime is 1201021013. The reversal of 1201021011 is 1101201021.

It is a happy number.

It is not a de Polignac number, because 1201021011 - 2² = 1201021007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 133446779 = 1201021011 / (1 + 2 + 0 + 1 + 0 + 2 + 1 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1201020984 and 1201021002.

It is not an unprimeable number, because it can be changed into a prime (1201021013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66723381 + ... + 66723398.

It is an arithmetic number, because the mean of its divisors is an integer number (289134690).

Almost surely, 2^1201021011 is an apocalyptic number.

1201021011 is a deficient number, since it is larger than the sum of its proper divisors (533787129).

1201021011 is a wasteful number, since it uses less digits than its factorization.

1201021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133446785 (or 133446782 counting only the distinct ones).

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

The square root of 1201021011 is about 34655.7500423811. The cubic root of 1201021011 is about 1062.9598687705.

Adding to 1201021011 its reverse (1101201021), we get a palindrome (2302222032).

The spelling of 1201021011 in words is "one billion, two hundred one million, twenty-one thousand, eleven".