21222312000 has 224 divisors, whose sum is σ = 71973033600. Its totient is φ = 5506099200.

The previous prime is 21222311959. The next prime is 21222312011. The reversal of 21222312000 is 21322212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 876051 + ... + 899949.

Almost surely, 2^21222312000 is an apocalyptic number.

21222312000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222312000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35986516800).

21222312000 is an abundant number, since it is smaller than the sum of its proper divisors (50750721600).

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

21222312000 is a wasteful number, since it uses less digits than its factorization.

21222312000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23966 (or 23946 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21222312000 its reverse (21322212), we get a palindrome (21243634212).

The spelling of 21222312000 in words is "twenty-one billion, two hundred twenty-two million, three hundred twelve thousand".