21220202122210 has 32 divisors (see below), whose sum is σ = 47010909318912. Its totient is φ = 6715844187840.

The previous prime is 21220202122129. The next prime is 21220202122241. The reversal of 21220202122210 is 1222120202212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11659450806 + ... + 11659452625.

It is an arithmetic number, because the mean of its divisors is an integer number (1469090916216).

Almost surely, 2^{21220202122210} is an apocalyptic number.

21220202122210 is an abundant number, since it is smaller than the sum of its proper divisors (25790707196702).

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

21220202122210 is a wasteful number, since it uses less digits than its factorization.

21220202122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23318903458.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21220202122210 its reverse (1222120202212), we get a palindrome (22442322324422).

The spelling of 21220202122210 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred twenty-two thousand, two hundred ten".