221205122444053 has 4 divisors (see below), whose sum is σ = 241314679029888. Its totient is φ = 201095565858220.

The previous prime is 221205122444027. The next prime is 221205122444077. The reversal of 221205122444053 is 350444221502122.

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 221205122444053 - 2¹⁷ = 221205122312981 is a prime.

It is a super-2 number, since 2×221205122444053² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221205122444093) 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, 10054778292901 + ... + 10054778292922.

It is an arithmetic number, because the mean of its divisors is an integer number (60328669757472).

Almost surely, 2^{221205122444053} is an apocalyptic number.

It is an amenable number.

221205122444053 is a deficient number, since it is larger than the sum of its proper divisors (20109556585835).

221205122444053 is a wasteful number, since it uses less digits than its factorization.

221205122444053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20109556585834.

The product of its (nonzero) digits is 153600, while the sum is 37.

Adding to 221205122444053 its reverse (350444221502122), we get a palindrome (571649343946175).

The spelling of 221205122444053 in words is "two hundred twenty-one trillion, two hundred five billion, one hundred twenty-two million, four hundred forty-four thousand, fifty-three".