21120220221210 has 48 divisors (see below), whose sum is σ = 59904624630240. Its totient is φ = 5120053386720.

The previous prime is 21120220221179. The next prime is 21120220221251. The reversal of 21120220221210 is 1212202202112.

It is a happy number.

21120220221210 is a `hidden beast` number, since 2 + 1 + 12 + 0 + 220 + 221 + 210 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10666776900 + ... + 10666778879.

It is an arithmetic number, because the mean of its divisors is an integer number (1248013013130).

Almost surely, 2^{21120220221210} is an apocalyptic number.

21120220221210 is an abundant number, since it is smaller than the sum of its proper divisors (38784404409030).

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

21120220221210 is a wasteful number, since it uses less digits than its factorization.

21120220221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21333555803 (or 21333555800 counting only the distinct ones).

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

Adding to 21120220221210 its reverse (1212202202112), we get a palindrome (22332422423322).

The spelling of 21120220221210 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, two hundred twenty-one thousand, two hundred ten".