21146732 has 6 divisors (see below), whose sum is σ = 37006788. Its totient is φ = 10573364.

The previous prime is 21146717. The next prime is 21146747. The reversal of 21146732 is 23764112.

It is an interprime number because it is at equal distance from previous prime (21146717) and next prime (21146747).

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 as a sum of consecutive naturals, namely, 2643338 + ... + 2643345.

It is an arithmetic number, because the mean of its divisors is an integer number (6167798).

Almost surely, 2^21146732 is an apocalyptic number.

It is an amenable number.

21146732 is a deficient number, since it is larger than the sum of its proper divisors (15860056).

21146732 is a wasteful number, since it uses less digits than its factorization.

21146732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286687 (or 5286685 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 21146732 is about 4598.5575999437. The cubic root of 21146732 is about 276.5335021487.

The spelling of 21146732 in words is "twenty-one million, one hundred forty-six thousand, seven hundred thirty-two".