22451555441521 has 4 divisors (see below), whose sum is σ = 23225747008500. Its totient is φ = 21677363874544.

The previous prime is 22451555441519. The next prime is 22451555441527. The reversal of 22451555441521 is 12514455515422.

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 7363489280625 + 15088066160896 = 2713575^2 + 3884336^2 .

It is a cyclic number.

It is not a de Polignac number, because 22451555441521 - 2¹ = 22451555441519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22451555441527) 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, 387095783446 + ... + 387095783503.

It is an arithmetic number, because the mean of its divisors is an integer number (5806436752125).

Almost surely, 2^{22451555441521} is an apocalyptic number.

It is an amenable number.

22451555441521 is a deficient number, since it is larger than the sum of its proper divisors (774191566979).

22451555441521 is an equidigital number, since it uses as much as digits as its factorization.

22451555441521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774191566978.

The product of its digits is 1600000, while the sum is 46.

The spelling of 22451555441521 in words is "twenty-two trillion, four hundred fifty-one billion, five hundred fifty-five million, four hundred forty-one thousand, five hundred twenty-one".