21822224420 has 48 divisors (see below), whose sum is σ = 48831536880. Its totient is φ = 8163078144.

The previous prime is 21822224419. The next prime is 21822224423. The reversal of 21822224420 is 2442222812.

It can be written as a sum of positive squares in 8 ways, for example, as 2862036004 + 18960188416 = 53498^2 + 137696^2 .

It is not an unprimeable number, because it can be changed into a prime (21822224423) 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, 151025 + ... + 257784.

It is an arithmetic number, because the mean of its divisors is an integer number (1017323685).

Almost surely, 2^21822224420 is an apocalyptic number.

21822224420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21822224420 is an abundant number, since it is smaller than the sum of its proper divisors (27009312460).

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

21822224420 is a wasteful number, since it uses less digits than its factorization.

21822224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408992 (or 408990 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 29.

The spelling of 21822224420 in words is "twenty-one billion, eight hundred twenty-two million, two hundred twenty-four thousand, four hundred twenty".