21542222226 has 64 divisors (see below), whose sum is σ = 49650112512. Its totient is φ = 6103673472.

The previous prime is 21542222209. The next prime is 21542222243. The reversal of 21542222226 is 62222224512.

It is an interprime number because it is at equal distance from previous prime (21542222209) and next prime (21542222243).

It is a junction number, because it is equal to n+sod(n) for n = 21542222193 and 21542222202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10626625 + ... + 10628651.

It is an arithmetic number, because the mean of its divisors is an integer number (775783008).

Almost surely, 2^21542222226 is an apocalyptic number.

21542222226 is an abundant number, since it is smaller than the sum of its proper divisors (28107890286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21542222226 is a wasteful number, since it uses less digits than its factorization.

21542222226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023.

The product of its digits is 15360, while the sum is 30.

Adding to 21542222226 its reverse (62222224512), we get a palindrome (83764446738).

The spelling of 21542222226 in words is "twenty-one billion, five hundred forty-two million, two hundred twenty-two thousand, two hundred twenty-six".