25222423421 has 16 divisors (see below), whose sum is σ = 27366734640. Its totient is φ = 23245260480.

The previous prime is 25222423409. The next prime is 25222423463. The reversal of 25222423421 is 12432422252.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 22683372100 + 2539051321 = 150610^2 + 50389^2 .

It is not a de Polignac number, because 25222423421 - 2⁶ = 25222423357 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 (25222423481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1425851 + ... + 1443431.

It is an arithmetic number, because the mean of its divisors is an integer number (1710420915).

Almost surely, 2^25222423421 is an apocalyptic number.

It is an amenable number.

25222423421 is a deficient number, since it is larger than the sum of its proper divisors (2144311219).

25222423421 is an equidigital number, since it uses as much as digits as its factorization.

25222423421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18273 (or 18247 counting only the distinct ones).

The product of its digits is 15360, while the sum is 29.

Adding to 25222423421 its reverse (12432422252), we get a palindrome (37654845673).

The spelling of 25222423421 in words is "twenty-five billion, two hundred twenty-two million, four hundred twenty-three thousand, four hundred twenty-one".