21526983 has 12 divisors (see below), whose sum is σ = 31141968. Its totient is φ = 14329440.

The previous prime is 21526979. The next prime is 21527021. The reversal of 21526983 is 38962512.

It is not a de Polignac number, because 21526983 - 2² = 21526979 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21527983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6318 + ... + 9108.

It is an arithmetic number, because the mean of its divisors is an integer number (2595164).

Almost surely, 2^21526983 is an apocalyptic number.

21526983 is a deficient number, since it is larger than the sum of its proper divisors (9614985).

21526983 is a wasteful number, since it uses less digits than its factorization.

21526983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654 (or 3651 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 21526983 is about 4639.7179871195. The cubic root of 21526983 is about 278.1811656632.

The spelling of 21526983 in words is "twenty-one million, five hundred twenty-six thousand, nine hundred eighty-three".