21370845 has 8 divisors (see below), whose sum is σ = 34193376. Its totient is φ = 11397776.

The previous prime is 21370829. The next prime is 21370847. The reversal of 21370845 is 54807312.

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

It is a cyclic number.

It is not a de Polignac number, because 21370845 - 2⁴ = 21370829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21370847) 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, 712347 + ... + 712376.

It is an arithmetic number, because the mean of its divisors is an integer number (4274172).

Almost surely, 2^21370845 is an apocalyptic number.

It is an amenable number.

21370845 is a deficient number, since it is larger than the sum of its proper divisors (12822531).

21370845 is a wasteful number, since it uses less digits than its factorization.

21370845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424731.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 21370845 is about 4622.8611270511. The cubic root of 21370845 is about 277.5069716616.

The spelling of 21370845 in words is "twenty-one million, three hundred seventy thousand, eight hundred forty-five".