2518223559421 has 4 divisors (see below), whose sum is σ = 2666354357052. Its totient is φ = 2370092761792.

The previous prime is 2518223559419. The next prime is 2518223559451. The reversal of 2518223559421 is 1249553228152.

It is a happy number.

2518223559421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2308761730521 + 209461828900 = 1519461^2 + 457670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2518223559421 - 2¹ = 2518223559419 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 (2518223559451) 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, 74065398790 + ... + 74065398823.

It is an arithmetic number, because the mean of its divisors is an integer number (666588589263).

Almost surely, 2^{2518223559421} is an apocalyptic number.

It is an amenable number.

2518223559421 is a deficient number, since it is larger than the sum of its proper divisors (148130797631).

2518223559421 is a wasteful number, since it uses less digits than its factorization.

2518223559421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148130797630.

The product of its digits is 1728000, while the sum is 49.

The spelling of 2518223559421 in words is "two trillion, five hundred eighteen billion, two hundred twenty-three million, five hundred fifty-nine thousand, four hundred twenty-one".