21202202121210 has 512 divisors, whose sum is σ = 65096256061440. Its totient is φ = 4862841350400.

The previous prime is 21202202121203. The next prime is 21202202121223. The reversal of 21202202121210 is 1212120220212.

It is a happy number.

21202202121210 is a `hidden beast` number, since 2 + 1 + 20 + 220 + 212 + 1 + 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 255 ways as a sum of consecutive naturals, for example, 4859544489 + ... + 4859548851.

It is an arithmetic number, because the mean of its divisors is an integer number (127141125120).

Almost surely, 2^{21202202121210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202202121210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32548128030720).

21202202121210 is an abundant number, since it is smaller than the sum of its proper divisors (43894053940230).

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

21202202121210 is a wasteful number, since it uses less digits than its factorization.

21202202121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5591 (or 5585 counting only the distinct ones).

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

Adding to 21202202121210 its reverse (1212120220212), we get a palindrome (22414322341422).

The spelling of 21202202121210 in words is "twenty-one trillion, two hundred two billion, two hundred two million, one hundred twenty-one thousand, two hundred ten".