21483649 has 4 divisors (see below), whose sum is σ = 23436720. Its totient is φ = 19530580.

The previous prime is 21483641. The next prime is 21483689. The reversal of 21483649 is 94638412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21483649 - 2³ = 21483641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21483641) 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, 976519 + ... + 976540.

It is an arithmetic number, because the mean of its divisors is an integer number (5859180).

Almost surely, 2^21483649 is an apocalyptic number.

It is an amenable number.

21483649 is a deficient number, since it is larger than the sum of its proper divisors (1953071).

21483649 is a wasteful number, since it uses less digits than its factorization.

21483649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953070.

The product of its digits is 41472, while the sum is 37.

The square root of 21483649 is about 4635.0457387171. The cubic root of 21483649 is about 277.9943799219.

The spelling of 21483649 in words is "twenty-one million, four hundred eighty-three thousand, six hundred forty-nine".