21020201022210 has 256 divisors, whose sum is σ = 58686488340480. Its totient is φ = 4773904128000.

The previous prime is 21020201022167. The next prime is 21020201022211. The reversal of 21020201022210 is 1222010202012.

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 21020201022210.

It is not an unprimeable number, because it can be changed into a prime (21020201022211) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 173414925 + ... + 173536095.

It is an arithmetic number, because the mean of its divisors is an integer number (229244095080).

Almost surely, 2^{21020201022210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020201022210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29343244170240).

21020201022210 is an abundant number, since it is smaller than the sum of its proper divisors (37666287318270).

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

21020201022210 is a wasteful number, since it uses less digits than its factorization.

21020201022210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121825.

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

Adding to 21020201022210 its reverse (1222010202012), we get a palindrome (22242211224222).

The spelling of 21020201022210 in words is "twenty-one trillion, twenty billion, two hundred one million, twenty-two thousand, two hundred ten".