21020022201121 has 4 divisors (see below), whose sum is σ = 21103767309744. Its totient is φ = 20936277092500.

The previous prime is 21020022200939. The next prime is 21020022201151. The reversal of 21020022201121 is 12110222002012.

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 21020022201121 - 2⁹ = 21020022200609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020022201095 and 21020022201104.

It is not an unprimeable number, because it can be changed into a prime (21020022201151) by changing a digit.

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, 41872553935 + ... + 41872554436.

It is an arithmetic number, because the mean of its divisors is an integer number (5275941827436).

Almost surely, 2^{21020022201121} is an apocalyptic number.

It is an amenable number.

21020022201121 is a deficient number, since it is larger than the sum of its proper divisors (83745108623).

21020022201121 is an equidigital number, since it uses as much as digits as its factorization.

21020022201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83745108622.

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

Adding to 21020022201121 its reverse (12110222002012), we get a palindrome (33130244203133).

The spelling of 21020022201121 in words is "twenty-one trillion, twenty billion, twenty-two million, two hundred one thousand, one hundred twenty-one".