21347045 has 8 divisors (see below), whose sum is σ = 26499960. Its totient is φ = 16488640.

The previous prime is 21347041. The next prime is 21347047. The reversal of 21347045 is 54074312.

It can be written as a sum of positive squares in 4 ways, for example, as 2951524 + 18395521 = 1718^2 + 4289^2 .

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

It is not a de Polignac number, because 21347045 - 2² = 21347041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347041) 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, 73466 + ... + 73755.

It is an arithmetic number, because the mean of its divisors is an integer number (3312495).

Almost surely, 2^21347045 is an apocalyptic number.

It is an amenable number.

21347045 is a deficient number, since it is larger than the sum of its proper divisors (5152915).

21347045 is a wasteful number, since it uses less digits than its factorization.

21347045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147255.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21347045 is about 4620.2862465436. The cubic root of 21347045 is about 277.4039166312.

The spelling of 21347045 in words is "twenty-one million, three hundred forty-seven thousand, forty-five".