21020222222210 has 16 divisors (see below), whose sum is σ = 40062070588536. Its totient is φ = 7913495424768.

The previous prime is 21020222222191. The next prime is 21020222222231. The reversal of 21020222222210 is 1222222202012.

It can be written as a sum of positive squares in 4 ways, for example, as 19168889176441 + 1851333045769 = 4378229^2 + 1360637^2 .

It is a super-3 number, since 3×21020222222210³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61824182837 + ... + 61824183176.

Almost surely, 2^{21020222222210} is an apocalyptic number.

21020222222210 is a deficient number, since it is larger than the sum of its proper divisors (19041848366326).

21020222222210 is a wasteful number, since it uses less digits than its factorization.

21020222222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123648366037.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21020222222210 its reverse (1222222202012), we get a palindrome (22242444424222).

The spelling of 21020222222210 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred ten".