21013067 has 4 divisors (see below), whose sum is σ = 21107520. Its totient is φ = 20918616.

The previous prime is 21013063. The next prime is 21013073. The reversal of 21013067 is 76031012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21013067 - 2² = 21013063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013061) 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, 46892 + ... + 47337.

It is an arithmetic number, because the mean of its divisors is an integer number (5276880).

Almost surely, 2^21013067 is an apocalyptic number.

21013067 is a deficient number, since it is larger than the sum of its proper divisors (94453).

21013067 is an equidigital number, since it uses as much as digits as its factorization.

21013067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94452.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21013067 is about 4584.0011998253. The cubic root of 21013067 is about 275.9496293641.

Adding to 21013067 its reverse (76031012), we get a palindrome (97044079).

The spelling of 21013067 in words is "twenty-one million, thirteen thousand, sixty-seven".