21010983 has 32 divisors (see below), whose sum is σ = 34255872. Its totient is φ = 11193600.

The previous prime is 21010973. The next prime is 21010987. The reversal of 21010983 is 38901012.

It is not a de Polignac number, because 21010983 - 2⁴ = 21010967 is a prime.

It is a super-2 number, since 2×21010983² = 882922813252578, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19273 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (1070496).

Almost surely, 2^21010983 is an apocalyptic number.

21010983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21010983 is a deficient number, since it is larger than the sum of its proper divisors (13244889).

21010983 is a wasteful number, since it uses less digits than its factorization.

21010983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21010983 is about 4583.7738818576. The cubic root of 21010983 is about 275.9405065004.

Adding to 21010983 its reverse (38901012), we get a palindrome (59911995).

The spelling of 21010983 in words is "twenty-one million, ten thousand, nine hundred eighty-three".