20101221222122 has 4 divisors (see below), whose sum is σ = 30151831833186. Its totient is φ = 10050610611060.

The previous prime is 20101221222119. The next prime is 20101221222127. The reversal of 20101221222122 is 22122212210102.

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., 19930072704721 + 171148517401 = 4464311^2 + 413701^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20101221222094 and 20101221222103.

It is not an unprimeable number, because it can be changed into a prime (20101221222127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025305305529 + ... + 5025305305532.

Almost surely, 2^{20101221222122} is an apocalyptic number.

20101221222122 is a deficient number, since it is larger than the sum of its proper divisors (10050610611064).

20101221222122 is a wasteful number, since it uses less digits than its factorization.

20101221222122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050610611063.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20101221222122 its reverse (22122212210102), we get a palindrome (42223433432224).

The spelling of 20101221222122 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-two".