21221201021122 has 8 divisors (see below), whose sum is σ = 31836348303372. Its totient is φ = 10609084920000.

The previous prime is 21221201021093. The next prime is 21221201021183. The reversal of 21221201021122 is 22112010212212.

It can be written as a sum of positive squares in 2 ways, for example, as 20807200143081 + 414000878041 = 4561491^2 + 643429^2 .

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 21221201021122.

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, 757777779 + ... + 757805782.

Almost surely, 2^{21221201021122} is an apocalyptic number.

21221201021122 is a deficient number, since it is larger than the sum of its proper divisors (10615147282250).

21221201021122 is a wasteful number, since it uses less digits than its factorization.

21221201021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515590564.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221201021122 its reverse (22112010212212), we get a palindrome (43333211233334).

The spelling of 21221201021122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, twenty-one thousand, one hundred twenty-two".