21234422000 has 80 divisors (see below), whose sum is σ = 56012602464. Its totient is φ = 7721600000.

The previous prime is 21234421993. The next prime is 21234422003. The reversal of 21234422000 is 22443212.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234422003) 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 15 ways as a sum of consecutive naturals, for example, 460601 + ... + 504600.

Almost surely, 2^21234422000 is an apocalyptic number.

21234422000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21234422000 is an abundant number, since it is smaller than the sum of its proper divisors (34778180464).

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

21234422000 is a wasteful number, since it uses less digits than its factorization.

21234422000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965235 (or 965219 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21234422000 its reverse (22443212), we get a palindrome (21256865212).

The spelling of 21234422000 in words is "twenty-one billion, two hundred thirty-four million, four hundred twenty-two thousand".