1211022111421 has 4 divisors (see below), whose sum is σ = 1211025383100. Its totient is φ = 1211018839744.

The previous prime is 1211022111407. The next prime is 1211022111487. The reversal of 1211022111421 is 1241112201121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 136741685796 + 1074280425625 = 369786^2 + 1036475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211022111421 - 2⁵ = 1211022111389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022111721) 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, 997606 + ... + 1848583.

It is an arithmetic number, because the mean of its divisors is an integer number (302756345775).

Almost surely, 2^{1211022111421} is an apocalyptic number.

It is an amenable number.

1211022111421 is a deficient number, since it is larger than the sum of its proper divisors (3271679).

1211022111421 is an equidigital number, since it uses as much as digits as its factorization.

1211022111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271678.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 1211022111421 its reverse (1241112201121), we get a palindrome (2452134312542).

The spelling of 1211022111421 in words is "one trillion, two hundred eleven billion, twenty-two million, one hundred eleven thousand, four hundred twenty-one".