21083432 has 8 divisors (see below), whose sum is σ = 39531450. Its totient is φ = 10541712.

The previous prime is 21083431. The next prime is 21083443. The reversal of 21083432 is 23438012.

It can be written as a sum of positive squares in only one way, i.e., 20666116 + 417316 = 4546^2 + 646^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21083432² = 889022209797248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21083398 and 21083407.

It is not an unprimeable number, because it can be changed into a prime (21083431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317707 + ... + 1317722.

Almost surely, 2^21083432 is an apocalyptic number.

It is an amenable number.

21083432 is a deficient number, since it is larger than the sum of its proper divisors (18448018).

21083432 is a wasteful number, since it uses less digits than its factorization.

21083432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635435 (or 2635431 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21083432 is about 4591.6698487587. The cubic root of 21083432 is about 276.2573039844.

The spelling of 21083432 in words is "twenty-one million, eighty-three thousand, four hundred thirty-two".