21201461 has 2 divisors, whose sum is σ = 21201462. Its totient is φ = 21201460.

The previous prime is 21201449. The next prime is 21201487. The reversal of 21201461 is 16410212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10923025 + 10278436 = 3305^2 + 3206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600730 + 10600731.

It is an arithmetic number, because the mean of its divisors is an integer number (10600731).

Almost surely, 2^21201461 is an apocalyptic number.

It is an amenable number.

21201461 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201461 is an equidigital number, since it uses as much as digits as its factorization.

21201461 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 17.

The square root of 21201461 is about 4604.5044250169. The cubic root of 21201461 is about 276.7718583564.

Adding to 21201461 its reverse (16410212), we get a palindrome (37611673).

The spelling of 21201461 in words is "twenty-one million, two hundred one thousand, four hundred sixty-one".