21221120221010 has 16 divisors (see below), whose sum is σ = 38215758199896. Its totient is φ = 8484505465728.

The previous prime is 21221120220893. The next prime is 21221120221117. The reversal of 21221120221010 is 1012202112212.

It can be written as a sum of positive squares in 4 ways, for example, as 8852035206169 + 12369085014841 = 2975237^2 + 3516971^2 .

It is a super-2 number, since 2×21221120221010² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221120221010.

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, 492805229 + ... + 492848288.

Almost surely, 2^{21221120221010} is an apocalyptic number.

21221120221010 is a deficient number, since it is larger than the sum of its proper divisors (16994637978886).

21221120221010 is a wasteful number, since it uses less digits than its factorization.

21221120221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985655677.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221120221010 its reverse (1012202112212), we get a palindrome (22233322333222).

It can be divided in two parts, 212211202 and 21010, that added together give a palindrome (212232212).

The spelling of 21221120221010 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, ten".