20021221112122 has 8 divisors (see below), whose sum is σ = 30187437014196. Its totient is φ = 9958742107392.

The previous prime is 20021221112089. The next prime is 20021221112131. The reversal of 20021221112122 is 22121112212002.

It can be written as a sum of positive squares in 2 ways, for example, as 17478411356961 + 2542809755161 = 4180719^2 + 1594619^2 .

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 20021221112122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25934223853 + ... + 25934224624.

Almost surely, 2^{20021221112122} is an apocalyptic number.

20021221112122 is a deficient number, since it is larger than the sum of its proper divisors (10166215902074).

20021221112122 is a wasteful number, since it uses less digits than its factorization.

20021221112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51868448672.

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

Adding to 20021221112122 its reverse (22121112212002), we get a palindrome (42142333324124).

The spelling of 20021221112122 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-two".