21200020020001 has 2 divisors, whose sum is σ = 21200020020002. Its totient is φ = 21200020020000.

The previous prime is 21200020019911. The next prime is 21200020020007. The reversal of 21200020020001 is 10002002000212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18093793542400 + 3106226477601 = 4253680^2 + 1762449^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200020020001 - 2¹⁹ = 21200019495713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21200020020001.

It is not a weakly prime, because it can be changed into another prime (21200020020007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600010010000 + 10600010010001.

It is an arithmetic number, because the mean of its divisors is an integer number (10600010010001).

Almost surely, 2^{21200020020001} is an apocalyptic number.

It is an amenable number.

21200020020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200020020001 is an equidigital number, since it uses as much as digits as its factorization.

21200020020001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21200020020001 its reverse (10002002000212), we get a palindrome (31202022020213).

The spelling of 21200020020001 in words is "twenty-one trillion, two hundred billion, twenty million, twenty thousand, one".