21220201021210 has 16 divisors (see below), whose sum is σ = 38574543640392. Its totient is φ = 8404040008000.

The previous prime is 21220201021189. The next prime is 21220201021219. The reversal of 21220201021210 is 1212010202212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16801136968561 + 4419064052649 = 4098919^2 + 2102157^2 .

It is not an unprimeable number, because it can be changed into a prime (21220201021219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10505049001 + ... + 10505051020.

Almost surely, 2^{21220201021210} is an apocalyptic number.

21220201021210 is a deficient number, since it is larger than the sum of its proper divisors (17354342619182).

21220201021210 is a wasteful number, since it uses less digits than its factorization.

21220201021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21010100129.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220201021210 its reverse (1212010202212), we get a palindrome (22432211223422).

The spelling of 21220201021210 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, twenty-one thousand, two hundred ten".