21153083 has 16 divisors (see below), whose sum is σ = 25790400. Its totient is φ = 16935936.

The previous prime is 21153079. The next prime is 21153091. The reversal of 21153083 is 38035112.

It is not a de Polignac number, because 21153083 - 2² = 21153079 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21153043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17135 + ... + 18327.

It is an arithmetic number, because the mean of its divisors is an integer number (1611900).

Almost surely, 2^21153083 is an apocalyptic number.

21153083 is a deficient number, since it is larger than the sum of its proper divisors (4637317).

21153083 is a wasteful number, since it uses less digits than its factorization.

21153083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21153083 is about 4599.2480907209. The cubic root of 21153083 is about 276.5611831552.

Adding to 21153083 its reverse (38035112), we get a palindrome (59188195).

The spelling of 21153083 in words is "twenty-one million, one hundred fifty-three thousand, eighty-three".