21022222004 has 24 divisors (see below), whose sum is σ = 42576656640. Its totient is φ = 8895478176.

The previous prime is 21022221923. The next prime is 21022222007. The reversal of 21022222004 is 40022222012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022222007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4749647 + ... + 4754070.

It is an arithmetic number, because the mean of its divisors is an integer number (1774027360).

Almost surely, 2^21022222004 is an apocalyptic number.

It is an amenable number.

21022222004 is an abundant number, since it is smaller than the sum of its proper divisors (21554434636).

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

21022222004 is a wasteful number, since it uses less digits than its factorization.

21022222004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9503807 (or 9503805 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21022222004 its reverse (40022222012), we get a palindrome (61044444016).

The spelling of 21022222004 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, four".