21020122332001 has 4 divisors (see below), whose sum is σ = 22637054819092. Its totient is φ = 19403189844912.

The previous prime is 21020122331903. The next prime is 21020122332007. The reversal of 21020122332001 is 10023322102012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2290061757025 + 18730060574976 = 1513295^2 + 4327824^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020122332001 - 2¹⁷ = 21020122200929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020122332001.

It is not an unprimeable number, because it can be changed into a prime (21020122332007) 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, 808466243526 + ... + 808466243551.

It is an arithmetic number, because the mean of its divisors is an integer number (5659263704773).

Almost surely, 2^{21020122332001} is an apocalyptic number.

It is an amenable number.

21020122332001 is a deficient number, since it is larger than the sum of its proper divisors (1616932487091).

21020122332001 is a wasteful number, since it uses less digits than its factorization.

21020122332001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616932487090.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21020122332001 its reverse (10023322102012), we get a palindrome (31043444434013).

The spelling of 21020122332001 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, three hundred thirty-two thousand, one".