21222233004 has 72 divisors (see below), whose sum is σ = 57693816768. Its totient is φ = 6053957280.

The previous prime is 21222233003. The next prime is 21222233113. The reversal of 21222233004 is 40033222212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21222233003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350019 + ... + 406149.

Almost surely, 2^21222233004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222233004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28846908384).

21222233004 is an abundant number, since it is smaller than the sum of its proper divisors (36471583764).

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

21222233004 is a wasteful number, since it uses less digits than its factorization.

21222233004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56795 (or 56786 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21222233004 its reverse (40033222212), we get a palindrome (61255455216).

The spelling of 21222233004 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-three thousand, four".