1211101013 has 4 divisors (see below), whose sum is σ = 1217442048. Its totient is φ = 1204759980.

The previous prime is 1211100997. The next prime is 1211101019. The reversal of 1211101013 is 3101011121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3101011121 = 13 ⋅238539317.

It is a cyclic number.

It is not a de Polignac number, because 1211101013 - 2⁴ = 1211100997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211100985 and 1211101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3170231 + ... + 3170612.

It is an arithmetic number, because the mean of its divisors is an integer number (304360512).

Almost surely, 2^1211101013 is an apocalyptic number.

It is an amenable number.

1211101013 is a deficient number, since it is larger than the sum of its proper divisors (6341035).

1211101013 is an equidigital number, since it uses as much as digits as its factorization.

1211101013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341034.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1211101013 is about 34800.8766125223. The cubic root of 1211101013 is about 1065.9253459236.

Adding to 1211101013 its reverse (3101011121), we get a palindrome (4312112134).

The spelling of 1211101013 in words is "one billion, two hundred eleven million, one hundred one thousand, thirteen".