21002222022210 has 288 divisors, whose sum is σ = 66729042993600. Its totient is φ = 4537734888960.

The previous prime is 21002222022209. The next prime is 21002222022217. The reversal of 21002222022210 is 1222022220012.

21002222022210 is a `hidden beast` number, since 21 + 0 + 0 + 222 + 202 + 221 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21002222022217) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2687701 + ... + 7016279.

It is an arithmetic number, because the mean of its divisors is an integer number (231698065950).

Almost surely, 2^{21002222022210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002222022210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33364521496800).

21002222022210 is an abundant number, since it is smaller than the sum of its proper divisors (45726820971390).

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

21002222022210 is a wasteful number, since it uses less digits than its factorization.

21002222022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328658 (or 4328642 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21002222022210 its reverse (1222022220012), we get a palindrome (22224244242222).

The spelling of 21002222022210 in words is "twenty-one trillion, two billion, two hundred twenty-two million, twenty-two thousand, two hundred ten".