21232013 has 8 divisors (see below), whose sum is σ = 24169536. Its totient is φ = 18462400.

The previous prime is 21232007. The next prime is 21232033. The reversal of 21232013 is 31023212.

It is a happy number.

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

It is not a de Polignac number, because 21232013 - 2⁸ = 21231757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41708 + ... + 42213.

It is an arithmetic number, because the mean of its divisors is an integer number (3021192).

Almost surely, 2^21232013 is an apocalyptic number.

21232013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21232013 is a deficient number, since it is larger than the sum of its proper divisors (2937523).

21232013 is a wasteful number, since it uses less digits than its factorization.

21232013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83955.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21232013 is about 4607.8208515523. The cubic root of 21232013 is about 276.9047403200.

Adding to 21232013 its reverse (31023212), we get a palindrome (52255225).

The spelling of 21232013 in words is "twenty-one million, two hundred thirty-two thousand, thirteen".