21222403404 has 12 divisors (see below), whose sum is σ = 49518941304. Its totient is φ = 7074134464.

The previous prime is 21222403369. The next prime is 21222403409. The reversal of 21222403404 is 40430422212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21222403404² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222403409) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 884266797 + ... + 884266820.

It is an arithmetic number, because the mean of its divisors is an integer number (4126578442).

Almost surely, 2^21222403404 is an apocalyptic number.

It is an amenable number.

21222403404 is an abundant number, since it is smaller than the sum of its proper divisors (28296537900).

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

21222403404 is a wasteful number, since it uses less digits than its factorization.

21222403404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768533624 (or 1768533622 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21222403404 its reverse (40430422212), we get a palindrome (61652825616).

The spelling of 21222403404 in words is "twenty-one billion, two hundred twenty-two million, four hundred three thousand, four hundred four".