21021221010122 has 8 divisors (see below), whose sum is σ = 31531869954372. Its totient is φ = 10510597692000.

The previous prime is 21021221010113. The next prime is 21021221010157. The reversal of 21021221010122 is 22101012212012.

It can be written as a sum of positive squares in 2 ways, for example, as 20719511393161 + 301709616961 = 4551869^2 + 549281^2 .

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 21021221010122.

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, 4204379 + ... + 7727822.

Almost surely, 2^{21021221010122} is an apocalyptic number.

21021221010122 is a deficient number, since it is larger than the sum of its proper divisors (10510648944250).

21021221010122 is a wasteful number, since it uses less digits than its factorization.

21021221010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12813064.

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

Adding to 21021221010122 its reverse (22101012212012), we get a palindrome (43122233222134).

The spelling of 21021221010122 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-one million, ten thousand, one hundred twenty-two".