21200461 has 2 divisors, whose sum is σ = 21200462. Its totient is φ = 21200460.

The previous prime is 21200401. The next prime is 21200467. The reversal of 21200461 is 16400212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 86436 = 4595^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200461 - 2⁹ = 21199949 is a prime.

It is a super-2 number, since 2×21200461² = 898919093225042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600230 + 10600231.

It is an arithmetic number, because the mean of its divisors is an integer number (10600231).

Almost surely, 2^21200461 is an apocalyptic number.

It is an amenable number.

21200461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200461 is an equidigital number, since it uses as much as digits as its factorization.

21200461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21200461 is about 4604.3958344174. The cubic root of 21200461 is about 276.7675068291.

Adding to 21200461 its reverse (16400212), we get a palindrome (37600673).

The spelling of 21200461 in words is "twenty-one million, two hundred thousand, four hundred sixty-one".