1211021021213 has 4 divisors (see below), whose sum is σ = 1219041028128. Its totient is φ = 1203001014300.

The previous prime is 1211021021191. The next prime is 1211021021219. The reversal of 1211021021213 is 3121201201121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1211021021213 - 2⁶ = 1211021021149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211021021191 and 1211021021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021021219) 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, 4010003231 + ... + 4010003532.

It is an arithmetic number, because the mean of its divisors is an integer number (304760257032).

Almost surely, 2^{1211021021213} is an apocalyptic number.

It is an amenable number.

1211021021213 is a deficient number, since it is larger than the sum of its proper divisors (8020006915).

1211021021213 is an equidigital number, since it uses as much as digits as its factorization.

1211021021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020006914.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1211021021213 its reverse (3121201201121), we get a palindrome (4332222222334).

The spelling of 1211021021213 in words is "one trillion, two hundred eleven billion, twenty-one million, twenty-one thousand, two hundred thirteen".