11442215021 has 4 divisors (see below), whose sum is σ = 11443137372. Its totient is φ = 11441292672.

The previous prime is 11442215011. The next prime is 11442215033. The reversal of 11442215021 is 12051224411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12051224411 = 19 ⋅634274969.

It can be written as a sum of positive squares in 2 ways, for example, as 10271822500 + 1170392521 = 101350^2 + 34211^2 .

It is a cyclic number.

It is not a de Polignac number, because 11442215021 - 2¹⁴ = 11442198637 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 (11442215011) 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, 442310 + ... + 467463.

It is an arithmetic number, because the mean of its divisors is an integer number (2860784343).

Almost surely, 2^11442215021 is an apocalyptic number.

It is an amenable number.

11442215021 is a deficient number, since it is larger than the sum of its proper divisors (922351).

11442215021 is an equidigital number, since it uses as much as digits as its factorization.

11442215021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922350.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 11442215021 its reverse (12051224411), we get a palindrome (23493439432).

The spelling of 11442215021 in words is "eleven billion, four hundred forty-two million, two hundred fifteen thousand, twenty-one".