1211413311021 has 4 divisors (see below), whose sum is σ = 1615217748032. Its totient is φ = 807608874012.

The previous prime is 1211413311019. The next prime is 1211413311041. The reversal of 1211413311021 is 1201133141121.

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 not a de Polignac number, because 1211413311021 - 2¹ = 1211413311019 is a prime.

It is a super-3 number, since 3×1211413311021³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211413311041) 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, 201902218501 + ... + 201902218506.

It is an arithmetic number, because the mean of its divisors is an integer number (403804437008).

Almost surely, 2^{1211413311021} is an apocalyptic number.

It is an amenable number.

1211413311021 is a deficient number, since it is larger than the sum of its proper divisors (403804437011).

1211413311021 is an equidigital number, since it uses as much as digits as its factorization.

1211413311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403804437010.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 1211413311021 its reverse (1201133141121), we get a palindrome (2412546452142).

The spelling of 1211413311021 in words is "one trillion, two hundred eleven billion, four hundred thirteen million, three hundred eleven thousand, twenty-one".