21363061 has 4 divisors (see below), whose sum is σ = 22052224. Its totient is φ = 20673900.

The previous prime is 21363059. The next prime is 21363077. The reversal of 21363061 is 16036312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21363061 - 2¹ = 21363059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344535 + ... + 344596.

It is an arithmetic number, because the mean of its divisors is an integer number (5513056).

Almost surely, 2^21363061 is an apocalyptic number.

It is an amenable number.

21363061 is a deficient number, since it is larger than the sum of its proper divisors (689163).

21363061 is an equidigital number, since it uses as much as digits as its factorization.

21363061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689162.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21363061 is about 4622.0191475155. The cubic root of 21363061 is about 277.4732750282.

Adding to 21363061 its reverse (16036312), we get a palindrome (37399373).

The spelling of 21363061 in words is "twenty-one million, three hundred sixty-three thousand, sixty-one".