1201211021011 has 16 divisors (see below), whose sum is σ = 1245863706048. Its totient is φ = 1157432515200.

The previous prime is 1201211020913. The next prime is 1201211021041. The reversal of 1201211021011 is 1101201121021.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201211021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201211020982 and 1201211021000.

It is not an unprimeable number, because it can be changed into a prime (1201211021041) 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, 1804621 + ... + 2378881.

It is an arithmetic number, because the mean of its divisors is an integer number (77866481628).

Almost surely, 2^{1201211021011} is an apocalyptic number.

1201211021011 is a deficient number, since it is larger than the sum of its proper divisors (44652685037).

1201211021011 is an equidigital number, since it uses as much as digits as its factorization.

1201211021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575022.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1201211021011 its reverse (1101201121021), we get a palindrome (2302412142032).

The spelling of 1201211021011 in words is "one trillion, two hundred one billion, two hundred eleven million, twenty-one thousand, eleven".