21220122010 has 16 divisors (see below), whose sum is σ = 38291479272. Its totient is φ = 8466880000.

The previous prime is 21220121971. The next prime is 21220122029. The reversal of 21220122010 is 1022102212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20050276801 + 1169845209 = 141599^2 + 34203^2 .

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, 2641891 + ... + 2649910.

Almost surely, 2^21220122010 is an apocalyptic number.

21220122010 is a deficient number, since it is larger than the sum of its proper divisors (17071357262).

21220122010 is a wasteful number, since it uses less digits than its factorization.

21220122010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292209.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220122010 its reverse (1022102212), we get a palindrome (22242224222).

The spelling of 21220122010 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, ten".