1211020013 has 12 divisors (see below), whose sum is σ = 1390514400. Its totient is φ = 1033171056.

The previous prime is 1211019919. The next prime is 1211020021. The reversal of 1211020013 is 3100201121.

It is not a de Polignac number, because 1211020013 - 2¹⁰ = 1211018989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211019976 and 1211020003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211020513) 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, 365438 + ... + 368736.

It is an arithmetic number, because the mean of its divisors is an integer number (115876200).

Almost surely, 2^1211020013 is an apocalyptic number.

It is an amenable number.

1211020013 is a deficient number, since it is larger than the sum of its proper divisors (179494387).

1211020013 is an frugal number, since it uses more digits than its factorization.

1211020013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764 (or 3535 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1211020013 is about 34799.7128292749. The cubic root of 1211020013 is about 1065.9015819059.

Adding to 1211020013 its reverse (3100201121), we get a palindrome (4311221134).

It can be divided in two parts, 12110 and 20013, that added together give a palindrome (32123).

The spelling of 1211020013 in words is "one billion, two hundred eleven million, twenty thousand, thirteen".