21332039 has 4 divisors (see below), whose sum is σ = 21348120. Its totient is φ = 21315960.

The previous prime is 21332029. The next prime is 21332053. The reversal of 21332039 is 93023312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21332039 - 2¹⁶ = 21266503 is a prime.

It is a super-4 number, since 4×21332039⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5852 + ... + 8769.

It is an arithmetic number, because the mean of its divisors is an integer number (5337030).

Almost surely, 2^21332039 is an apocalyptic number.

21332039 is a deficient number, since it is larger than the sum of its proper divisors (16081).

21332039 is a wasteful number, since it uses less digits than its factorization.

21332039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16080.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 21332039 is about 4618.6620356982. The cubic root of 21332039 is about 277.3389006230.

The spelling of 21332039 in words is "twenty-one million, three hundred thirty-two thousand, thirty-nine".