21055432 has 8 divisors (see below), whose sum is σ = 39478950. Its totient is φ = 10527712.

The previous prime is 21055429. The next prime is 21055451. The reversal of 21055432 is 23455012.

It can be written as a sum of positive squares in only one way, i.e., 20921476 + 133956 = 4574^2 + 366^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315957 + ... + 1315972.

Almost surely, 2^21055432 is an apocalyptic number.

It is an amenable number.

21055432 is a deficient number, since it is larger than the sum of its proper divisors (18423518).

21055432 is a wasteful number, since it uses less digits than its factorization.

21055432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631935 (or 2631931 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21055432 is about 4588.6198360727. The cubic root of 21055432 is about 276.1349546549.

The spelling of 21055432 in words is "twenty-one million, fifty-five thousand, four hundred thirty-two".