21210222012120 has 96 divisors (see below), whose sum is σ = 72988116945120. Its totient is φ = 5323349836800.

The previous prime is 21210222012107. The next prime is 21210222012121. The reversal of 21210222012120 is 2121022201212.

It is a happy number.

21210222012120 is a `hidden beast` number, since 21 + 210 + 2 + 220 + 1 + 212 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21210222012093 and 21210222012102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210222012121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1732855156 + ... + 1732867395.

It is an arithmetic number, because the mean of its divisors is an integer number (760292884845).

Almost surely, 2^{21210222012120} is an apocalyptic number.

21210222012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210222012120 is an abundant number, since it is smaller than the sum of its proper divisors (51777894933000).

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

21210222012120 is a wasteful number, since it uses less digits than its factorization.

21210222012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465722585 (or 3465722578 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210222012120 its reverse (2121022201212), we get a palindrome (23331244213332).

The spelling of 21210222012120 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, twelve thousand, one hundred twenty".