20021221101122 has 4 divisors (see below), whose sum is σ = 30031831651686. Its totient is φ = 10010610550560.

The previous prime is 20021221101071. The next prime is 20021221101169. The reversal of 20021221101122 is 22110112212002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13357848115921 + 6663372985201 = 3654839^2 + 2581351^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20021221101122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005305275279 + ... + 5005305275282.

Almost surely, 2^{20021221101122} is an apocalyptic number.

20021221101122 is a deficient number, since it is larger than the sum of its proper divisors (10010610550564).

20021221101122 is a wasteful number, since it uses less digits than its factorization.

20021221101122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010610550563.

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

Adding to 20021221101122 its reverse (22110112212002), we get a palindrome (42131333313124).

The spelling of 20021221101122 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, one hundred twenty-two".