21230022000 has 320 divisors, whose sum is σ = 75798148608. Its totient is φ = 5068800000.

The previous prime is 21230021941. The next prime is 21230022017. The reversal of 21230022000 is 22003212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 4419600 + ... + 4424400.

Almost surely, 2^21230022000 is an apocalyptic number.

21230022000 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 21230022000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37899074304).

21230022000 is an abundant number, since it is smaller than the sum of its proper divisors (54568126608).

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

21230022000 is a wasteful number, since it uses less digits than its factorization.

21230022000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4905 (or 4889 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21230022000 its reverse (22003212), we get a palindrome (21252025212).

The spelling of 21230022000 in words is "twenty-one billion, two hundred thirty million, twenty-two thousand".