21020120122001 has 16 divisors (see below), whose sum is σ = 28222818626688. Its totient is φ = 15119367120000.

The previous prime is 21020120121937. The next prime is 21020120122007. The reversal of 21020120122001 is 10022102102012.

It is not a de Polignac number, because 21020120122001 - 2⁶ = 21020120121937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020120122007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10499559500 + ... + 10499561501.

It is an arithmetic number, because the mean of its divisors is an integer number (1763926164168).

Almost surely, 2^{21020120122001} is an apocalyptic number.

It is an amenable number.

21020120122001 is a deficient number, since it is larger than the sum of its proper divisors (7202698504687).

21020120122001 is a wasteful number, since it uses less digits than its factorization.

21020120122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20999121032.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020120122001 its reverse (10022102102012), we get a palindrome (31042222224013).

The spelling of 21020120122001 in words is "twenty-one trillion, twenty billion, one hundred twenty million, one hundred twenty-two thousand, one".