21461732 has 6 divisors (see below), whose sum is σ = 37558038. Its totient is φ = 10730864.

The previous prime is 21461731. The next prime is 21461747. The reversal of 21461732 is 23716412.

It can be written as a sum of positive squares in only one way, i.e., 21031396 + 430336 = 4586^2 + 656^2 .

It is not an unprimeable number, because it can be changed into a prime (21461731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2682713 + ... + 2682720.

It is an arithmetic number, because the mean of its divisors is an integer number (6259673).

Almost surely, 2^21461732 is an apocalyptic number.

It is an amenable number.

21461732 is a deficient number, since it is larger than the sum of its proper divisors (16096306).

21461732 is a wasteful number, since it uses less digits than its factorization.

21461732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365437 (or 5365435 counting only the distinct ones).

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

The square root of 21461732 is about 4632.6808653306. The cubic root of 21461732 is about 277.8998138033.

The spelling of 21461732 in words is "twenty-one million, four hundred sixty-one thousand, seven hundred thirty-two".