21301013 has 4 divisors (see below), whose sum is σ = 22227168. Its totient is φ = 20374860.

The previous prime is 21300997. The next prime is 21301031. The reversal of 21301013 is 31010312.

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 a cyclic number.

It is not a de Polignac number, because 21301013 - 2⁴ = 21300997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300985 and 21301003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301043) 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, 463043 + ... + 463088.

It is an arithmetic number, because the mean of its divisors is an integer number (5556792).

Almost surely, 2^21301013 is an apocalyptic number.

21301013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21301013 is a deficient number, since it is larger than the sum of its proper divisors (926155).

21301013 is an equidigital number, since it uses as much as digits as its factorization.

21301013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926154.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21301013 is about 4615.3020486204. The cubic root of 21301013 is about 277.2043785275.

Adding to 21301013 its reverse (31010312), we get a palindrome (52311325).

The spelling of 21301013 in words is "twenty-one million, three hundred one thousand, thirteen".