21201222202110 has 256 divisors, whose sum is σ = 57970781706240. Its totient is φ = 5512147200000.

The previous prime is 21201222202091. The next prime is 21201222202129. The reversal of 21201222202110 is 1120222210212.

It is a happy number.

21201222202110 is a `hidden beast` number, since 212 + 0 + 1 + 22 + 220 + 211 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21201222202091) and next prime (21201222202129).

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

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 1709631910 + ... + 1709644310.

It is an arithmetic number, because the mean of its divisors is an integer number (226448366040).

Almost surely, 2^{21201222202110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201222202110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28985390853120).

21201222202110 is an abundant number, since it is smaller than the sum of its proper divisors (36769559504130).

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

21201222202110 is a wasteful number, since it uses less digits than its factorization.

21201222202110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13472 (or 13466 counting only the distinct ones).

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

Adding to 21201222202110 its reverse (1120222210212), we get a palindrome (22321444412322).

The spelling of 21201222202110 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred two thousand, one hundred ten".