21463601 has 2 divisors, whose sum is σ = 21463602. Its totient is φ = 21463600.

The previous prime is 21463583. The next prime is 21463609. The reversal of 21463601 is 10636412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21160000 + 303601 = 4600^2 + 551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21463601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21463609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10731800 + 10731801.

It is an arithmetic number, because the mean of its divisors is an integer number (10731801).

Almost surely, 2^21463601 is an apocalyptic number.

It is an amenable number.

21463601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21463601 is an equidigital number, since it uses as much as digits as its factorization.

21463601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21463601 is about 4632.8825799927. The cubic root of 21463601 is about 277.9078805594.

The spelling of 21463601 in words is "twenty-one million, four hundred sixty-three thousand, six hundred one".