21341507 has 4 divisors (see below), whose sum is σ = 23281656. Its totient is φ = 19401360.

The previous prime is 21341501. The next prime is 21341527. The reversal of 21341507 is 70514312.

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

It is not a de Polignac number, because 21341507 - 2⁴ = 21341491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970058 + ... + 970079.

It is an arithmetic number, because the mean of its divisors is an integer number (5820414).

Almost surely, 2^21341507 is an apocalyptic number.

21341507 is a deficient number, since it is larger than the sum of its proper divisors (1940149).

21341507 is a wasteful number, since it uses less digits than its factorization.

21341507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1940148.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21341507 is about 4619.6868941520. The cubic root of 21341507 is about 277.3799258671.

Adding to 21341507 its reverse (70514312), we get a palindrome (91855819).

The spelling of 21341507 in words is "twenty-one million, three hundred forty-one thousand, five hundred seven".