21477132 has 18 divisors (see below), whose sum is σ = 54289508. Its totient is φ = 7159032.

The previous prime is 21477109. The next prime is 21477133. The reversal of 21477132 is 23177412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21477132² = 922534397890848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21477096 and 21477105.

It is not an unprimeable number, because it can be changed into a prime (21477133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298258 + ... + 298329.

Almost surely, 2^21477132 is an apocalyptic number.

It is an amenable number.

21477132 is an abundant number, since it is smaller than the sum of its proper divisors (32812376).

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

21477132 is a wasteful number, since it uses less digits than its factorization.

21477132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596597 (or 596592 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 21477132 is about 4634.3426718360. The cubic root of 21477132 is about 277.9662674941.

It can be divided in two parts, 21477 and 132, that added together give a square (21609 = 147²).

The spelling of 21477132 in words is "twenty-one million, four hundred seventy-seven thousand, one hundred thirty-two".