21421400201 has 2 divisors, whose sum is σ = 21421400202. Its totient is φ = 21421400200.

The previous prime is 21421400153. The next prime is 21421400237. The reversal of 21421400201 is 10200412412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20499366976 + 922033225 = 143176^2 + 30365^2 .

It is a cyclic number.

It is not a de Polignac number, because 21421400201 - 2¹⁰ = 21421399177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21421400201.

It is not a weakly prime, because it can be changed into another prime (21421400251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710700100 + 10710700101.

It is an arithmetic number, because the mean of its divisors is an integer number (10710700101).

Almost surely, 2^21421400201 is an apocalyptic number.

It is an amenable number.

21421400201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421400201 is an equidigital number, since it uses as much as digits as its factorization.

21421400201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21421400201 its reverse (10200412412), we get a palindrome (31621812613).

The spelling of 21421400201 in words is "twenty-one billion, four hundred twenty-one million, four hundred thousand, two hundred one".