21332015 has 8 divisors (see below), whose sum is σ = 25668240. Its totient is φ = 17019072.

The previous prime is 21332009. The next prime is 21332029. The reversal of 21332015 is 51023312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21332015 - 2¹² = 21327919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331984 and 21332002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3734 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (3208530).

Almost surely, 2^21332015 is an apocalyptic number.

21332015 is a deficient number, since it is larger than the sum of its proper divisors (4336225).

21332015 is a wasteful number, since it uses less digits than its factorization.

21332015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11641.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21332015 is about 4618.6594375425. The cubic root of 21332015 is about 277.3387966146.

Adding to 21332015 its reverse (51023312), we get a palindrome (72355327).

The spelling of 21332015 in words is "twenty-one million, three hundred thirty-two thousand, fifteen".