21460501 has 2 divisors, whose sum is σ = 21460502. Its totient is φ = 21460500.

The previous prime is 21460499. The next prime is 21460547. The reversal of 21460501 is 10506412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 5058001 = 4050^2 + 2249^2 .

It is a cyclic number.

It is not a de Polignac number, because 21460501 - 2¹ = 21460499 is a prime.

Together with 21460499, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21460591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730250 + 10730251.

It is an arithmetic number, because the mean of its divisors is an integer number (10730251).

Almost surely, 2^21460501 is an apocalyptic number.

It is an amenable number.

21460501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21460501 is an equidigital number, since it uses as much as digits as its factorization.

21460501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21460501 is about 4632.5480029893. The cubic root of 21460501 is about 277.8945004513.

Adding to 21460501 its reverse (10506412), we get a palindrome (31966913).

The spelling of 21460501 in words is "twenty-one million, four hundred sixty thousand, five hundred one".