11421211444021 has 4 divisors (see below), whose sum is σ = 11699777576844. Its totient is φ = 11142645311200.

The previous prime is 11421211444009. The next prime is 11421211444079. The reversal of 11421211444021 is 12044411212411.

It is a happy number.

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 4095013620996 + 7326197823025 = 2023614^2 + 2706695^2 .

It is a cyclic number.

It is not a de Polignac number, because 11421211444021 - 2¹⁷ = 11421211312949 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 (11421211444121) 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, 139283066350 + ... + 139283066431.

It is an arithmetic number, because the mean of its divisors is an integer number (2924944394211).

Almost surely, 2^{11421211444021} is an apocalyptic number.

It is an amenable number.

11421211444021 is a deficient number, since it is larger than the sum of its proper divisors (278566132823).

11421211444021 is an equidigital number, since it uses as much as digits as its factorization.

11421211444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278566132822.

The product of its (nonzero) digits is 2048, while the sum is 28.

Adding to 11421211444021 its reverse (12044411212411), we get a palindrome (23465622656432).

The spelling of 11421211444021 in words is "eleven trillion, four hundred twenty-one billion, two hundred eleven million, four hundred forty-four thousand, twenty-one".