42144402221 has 4 divisors (see below), whose sum is σ = 43597657500. Its totient is φ = 40691146944.

The previous prime is 42144402193. The next prime is 42144402241. The reversal of 42144402221 is 12220444124.

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 14523624196 + 27620778025 = 120514^2 + 166195^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144402221 - 2³⁴ = 24964533037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42144402241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726627596 + ... + 726627653.

It is an arithmetic number, because the mean of its divisors is an integer number (10899414375).

Almost surely, 2^42144402221 is an apocalyptic number.

It is an amenable number.

42144402221 is a deficient number, since it is larger than the sum of its proper divisors (1453255279).

42144402221 is a wasteful number, since it uses less digits than its factorization.

42144402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453255278.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 42144402221 its reverse (12220444124), we get a palindrome (54364846345).

The spelling of 42144402221 in words is "forty-two billion, one hundred forty-four million, four hundred two thousand, two hundred twenty-one".