21361732 has 12 divisors (see below), whose sum is σ = 42723520. Its totient is φ = 9155016.

The previous prime is 21361729. The next prime is 21361763. The reversal of 21361732 is 23716312.

21361732 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21361697 and 21361706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381432 + ... + 381487.

Almost surely, 2^21361732 is an apocalyptic number.

It is an amenable number.

21361732 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361732 is a wasteful number, since it uses less digits than its factorization.

21361732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762930 (or 762928 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 21361732 is about 4621.8753769439. The cubic root of 21361732 is about 277.4675210209.

The spelling of 21361732 in words is "twenty-one million, three hundred sixty-one thousand, seven hundred thirty-two".