21227222442 has 8 divisors (see below), whose sum is σ = 42454444896. Its totient is φ = 7075740812.

The previous prime is 21227222407. The next prime is 21227222449. The reversal of 21227222442 is 24422272212.

It is a sphenic number, since it is the product of 3 distinct primes.

21227222442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21227222449) 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, 1768935198 + ... + 1768935209.

It is an arithmetic number, because the mean of its divisors is an integer number (5306805612).

Almost surely, 2^21227222442 is an apocalyptic number.

21227222442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21227222442 is a wasteful number, since it uses less digits than its factorization.

21227222442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537870412.

The product of its digits is 14336, while the sum is 30.

Adding to 21227222442 its reverse (24422272212), we get a palindrome (45649494654).

The spelling of 21227222442 in words is "twenty-one billion, two hundred twenty-seven million, two hundred twenty-two thousand, four hundred forty-two".