21483397 has 4 divisors (see below), whose sum is σ = 23135980. Its totient is φ = 19830816.

The previous prime is 21483373. The next prime is 21483419. The reversal of 21483397 is 79338412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4186116 + 17297281 = 2046^2 + 4159^2 .

It is a cyclic number.

It is not a de Polignac number, because 21483397 - 2¹⁵ = 21450629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21483307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826272 + ... + 826297.

It is an arithmetic number, because the mean of its divisors is an integer number (5783995).

Almost surely, 2^21483397 is an apocalyptic number.

It is an amenable number.

21483397 is a deficient number, since it is larger than the sum of its proper divisors (1652583).

21483397 is a wasteful number, since it uses less digits than its factorization.

21483397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652582.

The product of its digits is 36288, while the sum is 37.

The square root of 21483397 is about 4635.0185544397. The cubic root of 21483397 is about 277.9932929735.

The spelling of 21483397 in words is "twenty-one million, four hundred eighty-three thousand, three hundred ninety-seven".