21222022000 has 160 divisors (see below), whose sum is σ = 52480194624. Its totient is φ = 8297856000.

The previous prime is 21222021979. The next prime is 21222022021. The reversal of 21222022000 is 22022212.

It is an interprime number because it is at equal distance from previous prime (21222021979) and next prime (21222022021).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24033559 + ... + 24034441.

Almost surely, 2^21222022000 is an apocalyptic number.

21222022000 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 21222022000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26240097312).

21222022000 is an abundant number, since it is smaller than the sum of its proper divisors (31258172624).

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

21222022000 is a wasteful number, since it uses less digits than its factorization.

21222022000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164 (or 1148 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 21222022000 its reverse (22022212), we get a palindrome (21244044212).

The spelling of 21222022000 in words is "twenty-one billion, two hundred twenty-two million, twenty-two thousand".