21355083 has 12 divisors (see below), whose sum is σ = 31989048. Its totient is φ = 14236560.

The previous prime is 21355057. The next prime is 21355091. The reversal of 21355083 is 38055312.

It is not a de Polignac number, because 21355083 - 2¹⁰ = 21354059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21355003) 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, 43698 + ... + 44183.

It is an arithmetic number, because the mean of its divisors is an integer number (2665754).

Almost surely, 2^21355083 is an apocalyptic number.

21355083 is a deficient number, since it is larger than the sum of its proper divisors (10633965).

21355083 is an frugal number, since it uses more digits than its factorization.

21355083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87896 (or 87884 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 21355083 is about 4621.1560242000. The cubic root of 21355083 is about 277.4387300815.

The spelling of 21355083 in words is "twenty-one million, three hundred fifty-five thousand, eighty-three".