21022212000 has 96 divisors (see below), whose sum is σ = 68868805824. Its totient is φ = 5605920000.

The previous prime is 21022211999. The next prime is 21022212017. The reversal of 21022212000 is 21222012.

It is a tau number, because it is divible by the number of its divisors (96).

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

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 15 ways as a sum of consecutive naturals, for example, 863926 + ... + 887925.

It is an arithmetic number, because the mean of its divisors is an integer number (717383394).

Almost surely, 2^21022212000 is an apocalyptic number.

21022212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022212000 is an abundant number, since it is smaller than the sum of its proper divisors (47846593824).

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

21022212000 is a wasteful number, since it uses less digits than its factorization.

21022212000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751879 (or 1751861 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21022212000 its reverse (21222012), we get a palindrome (21043434012).

It can be divided in two parts, 210222 and 12000, that added together give a palindrome (222222).

The spelling of 21022212000 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand".