21000122022001 has 4 divisors (see below), whose sum is σ = 21052491404004. Its totient is φ = 20947752640000.

The previous prime is 21000122021911. The next prime is 21000122022007. The reversal of 21000122022001 is 10022022100012.

It is a happy number.

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 9985290322401 + 11014831699600 = 3159951^2 + 3318860^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000122022001 - 2¹¹ = 21000122019953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000122022007) 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, 26184690400 + ... + 26184691201.

It is an arithmetic number, because the mean of its divisors is an integer number (5263122851001).

Almost surely, 2^{21000122022001} is an apocalyptic number.

It is an amenable number.

21000122022001 is a deficient number, since it is larger than the sum of its proper divisors (52369382003).

21000122022001 is an equidigital number, since it uses as much as digits as its factorization.

21000122022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52369382002.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000122022001 its reverse (10022022100012), we get a palindrome (31022144122013).

The spelling of 21000122022001 in words is "twenty-one trillion, one hundred twenty-two million, twenty-two thousand, one".