21210022020210 has 256 divisors, whose sum is σ = 54971070391296. Its totient is φ = 5218304000000.

The previous prime is 21210022020163. The next prime is 21210022020233. The reversal of 21210022020210 is 1202022001212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21210022020210.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5301178210 + ... + 5301182210.

It is an arithmetic number, because the mean of its divisors is an integer number (214730743716).

Almost surely, 2^{21210022020210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210022020210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27485535195648).

21210022020210 is an abundant number, since it is smaller than the sum of its proper divisors (33761048371086).

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

21210022020210 is a wasteful number, since it uses less digits than its factorization.

21210022020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21210022020210 its reverse (1202022001212), we get a palindrome (22412044021422).

The spelling of 21210022020210 in words is "twenty-one trillion, two hundred ten billion, twenty-two million, twenty thousand, two hundred ten".