21210120222000 has 80 divisors (see below), whose sum is σ = 68381427615072. Its totient is φ = 5656032057600.

The previous prime is 21210120221989. The next prime is 21210120222007. The reversal of 21210120222000 is 22202101212.

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 (15).

It is not an unprimeable number, because it can be changed into a prime (21210120222007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1767504019 + ... + 1767516018.

Almost surely, 2^{21210120222000} is an apocalyptic number.

21210120222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210120222000 is an abundant number, since it is smaller than the sum of its proper divisors (47171307393072).

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

21210120222000 is a wasteful number, since it uses less digits than its factorization.

21210120222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535020063 (or 3535020047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21210120222000 its reverse (22202101212), we get a palindrome (21232322323212).

The spelling of 21210120222000 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, two hundred twenty-two thousand".