21220221010 has 8 divisors (see below), whose sum is σ = 38196397836. Its totient is φ = 8488088400.

The previous prime is 21220220941. The next prime is 21220221031. The reversal of 21220221010 is 1012202212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21187422481 + 32798529 = 145559^2 + 5727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061011041 + ... + 1061011060.

Almost surely, 2^21220221010 is an apocalyptic number.

21220221010 is a deficient number, since it is larger than the sum of its proper divisors (16976176826).

21220221010 is a wasteful number, since it uses less digits than its factorization.

21220221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122022108.

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

Adding to 21220221010 its reverse (1012202212), we get a palindrome (22232423222).

The spelling of 21220221010 in words is "twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, ten".