21221120122010 has 8 divisors (see below), whose sum is σ = 38198016219636. Its totient is φ = 8488448048800.

The previous prime is 21221120121989. The next prime is 21221120122021. The reversal of 21221120122010 is 1022102112212.

It can be written as a sum of positive squares in 2 ways, for example, as 20925620249209 + 295499872801 = 4574453^2 + 543599^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21221120122010.

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, 1061056006091 + ... + 1061056006110.

Almost surely, 2^{21221120122010} is an apocalyptic number.

21221120122010 is a deficient number, since it is larger than the sum of its proper divisors (16976896097626).

21221120122010 is a wasteful number, since it uses less digits than its factorization.

21221120122010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122112012208.

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

Adding to 21221120122010 its reverse (1022102112212), we get a palindrome (22243222234222).

The spelling of 21221120122010 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twenty-two thousand, ten".