21380973 has 8 divisors (see below), whose sum is σ = 28933728. Its totient is φ = 14041104.

The previous prime is 21380971. The next prime is 21380977. The reversal of 21380973 is 37908312.

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

It is not a de Polignac number, because 21380973 - 2¹ = 21380971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21380971) 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, 52986 + ... + 53387.

It is an arithmetic number, because the mean of its divisors is an integer number (3616716).

Almost surely, 2^21380973 is an apocalyptic number.

It is an amenable number.

21380973 is a deficient number, since it is larger than the sum of its proper divisors (7552755).

21380973 is a wasteful number, since it uses less digits than its factorization.

21380973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106443.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21380973 is about 4623.9564228050. The cubic root of 21380973 is about 277.5508031327.

The spelling of 21380973 in words is "twenty-one million, three hundred eighty thousand, nine hundred seventy-three".