21483651 has 32 divisors (see below), whose sum is σ = 34410496. Its totient is φ = 11664000.

The previous prime is 21483641. The next prime is 21483689. The reversal of 21483651 is 15638412.

It is not a de Polignac number, because 21483651 - 2⁷ = 21483523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21483641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39441 + ... + 39981.

It is an arithmetic number, because the mean of its divisors is an integer number (1075328).

Almost surely, 2^21483651 is an apocalyptic number.

21483651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21483651 is a deficient number, since it is larger than the sum of its proper divisors (12926845).

21483651 is a wasteful number, since it uses less digits than its factorization.

21483651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643.

The product of its digits is 5760, while the sum is 30.

The square root of 21483651 is about 4635.0459544647. The cubic root of 21483651 is about 277.9943885485.

The spelling of 21483651 in words is "twenty-one million, four hundred eighty-three thousand, six hundred fifty-one".