20021122120021 has 4 divisors (see below), whose sum is σ = 21841224130944. Its totient is φ = 18201020109100.

The previous prime is 20021122119953. The next prime is 20021122120039. The reversal of 20021122120021 is 12002122112002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20021122120021 - 2⁷ = 20021122119893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021122119977 and 20021122120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021122120081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910051005445 + ... + 910051005466.

It is an arithmetic number, because the mean of its divisors is an integer number (5460306032736).

Almost surely, 2^{20021122120021} is an apocalyptic number.

It is an amenable number.

20021122120021 is a deficient number, since it is larger than the sum of its proper divisors (1820102010923).

20021122120021 is a wasteful number, since it uses less digits than its factorization.

20021122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820102010922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021122120021 its reverse (12002122112002), we get a palindrome (32023244232023).

The spelling of 20021122120021 in words is "twenty trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".