21442221204 has 24 divisors (see below), whose sum is σ = 51384062688. Its totient is φ = 6954233760.

The previous prime is 21442221191. The next prime is 21442221211. The reversal of 21442221204 is 40212224412.

It is a happy number.

It is a super-2 number, since 2×21442221204² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24146202 + ... + 24147089.

It is an arithmetic number, because the mean of its divisors is an integer number (2141002612).

Almost surely, 2^21442221204 is an apocalyptic number.

It is an amenable number.

21442221204 is an abundant number, since it is smaller than the sum of its proper divisors (29941841484).

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

21442221204 is a wasteful number, since it uses less digits than its factorization.

21442221204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48293335 (or 48293333 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21442221204 its reverse (40212224412), we get a palindrome (61654445616).

The spelling of 21442221204 in words is "twenty-one billion, four hundred forty-two million, two hundred twenty-one thousand, two hundred four".