21001220022022 has 4 divisors (see below), whose sum is σ = 31501830033036. Its totient is φ = 10500610011010.

The previous prime is 21001220022019. The next prime is 21001220022089. The reversal of 21001220022022 is 22022002210012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001220021987 and 21001220022005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250305005504 + ... + 5250305005507.

It is an arithmetic number, because the mean of its divisors is an integer number (7875457508259).

Almost surely, 2^{21001220022022} is an apocalyptic number.

21001220022022 is a deficient number, since it is larger than the sum of its proper divisors (10500610011014).

21001220022022 is a wasteful number, since it uses less digits than its factorization.

21001220022022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500610011013.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21001220022022 its reverse (22022002210012), we get a palindrome (43023222232034).

The spelling of 21001220022022 in words is "twenty-one trillion, one billion, two hundred twenty million, twenty-two thousand, twenty-two".