21020202022201 has 8 divisors (see below), whose sum is σ = 21235600582344. Its totient is φ = 20804946163200.

The previous prime is 21020202022187. The next prime is 21020202022271. The reversal of 21020202022201 is 10222020202012.

It can be written as a sum of positive squares in 4 ways, for example, as 10557073197225 + 10463128824976 = 3249165^2 + 3234676^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020202022201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020202022271) 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 7 ways as a sum of consecutive naturals, for example, 35379160 + ... + 35968393.

It is an arithmetic number, because the mean of its divisors is an integer number (2654450072793).

Almost surely, 2^{21020202022201} is an apocalyptic number.

It is an amenable number.

21020202022201 is a deficient number, since it is larger than the sum of its proper divisors (215398560143).

21020202022201 is a wasteful number, since it uses less digits than its factorization.

21020202022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71350571.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020202022201 its reverse (10222020202012), we get a palindrome (31242222224213).

The spelling of 21020202022201 in words is "twenty-one trillion, twenty billion, two hundred two million, twenty-two thousand, two hundred one".