21141345 has 16 divisors (see below), whose sum is σ = 34235712. Its totient is φ = 11138880.

The previous prime is 21141317. The next prime is 21141361. The reversal of 21141345 is 54314112.

It is not a de Polignac number, because 21141345 - 2⁸ = 21141089 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7246 + ... + 9735.

It is an arithmetic number, because the mean of its divisors is an integer number (2139732).

Almost surely, 2^21141345 is an apocalyptic number.

It is an amenable number.

21141345 is a deficient number, since it is larger than the sum of its proper divisors (13094367).

21141345 is a wasteful number, since it uses less digits than its factorization.

21141345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17072.

The product of its digits is 480, while the sum is 21.

The square root of 21141345 is about 4597.9718354944. The cubic root of 21141345 is about 276.5100184178.

Adding to 21141345 its reverse (54314112), we get a palindrome (75455457).

The spelling of 21141345 in words is "twenty-one million, one hundred forty-one thousand, three hundred forty-five".