21146345 has 8 divisors (see below), whose sum is σ = 27682560. Its totient is φ = 15379120.

The previous prime is 21146329. The next prime is 21146347. The reversal of 21146345 is 54364112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21146345 - 2⁴ = 21146329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21146347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192185 + ... + 192294.

It is an arithmetic number, because the mean of its divisors is an integer number (3460320).

Almost surely, 2^21146345 is an apocalyptic number.

It is an amenable number.

21146345 is a deficient number, since it is larger than the sum of its proper divisors (6536215).

21146345 is a wasteful number, since it uses less digits than its factorization.

21146345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384495.

The product of its digits is 2880, while the sum is 26.

The square root of 21146345 is about 4598.5155213395. The cubic root of 21146345 is about 276.5318152195.

The spelling of 21146345 in words is "twenty-one million, one hundred forty-six thousand, three hundred forty-five".