21015032 has 8 divisors (see below), whose sum is σ = 39403200. Its totient is φ = 10507512.

The previous prime is 21015023. The next prime is 21015041. The reversal of 21015032 is 23051012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21015023) and next prime (21015041).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21015032² = 883263139922048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21014998 and 21015016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313432 + ... + 1313447.

It is an arithmetic number, because the mean of its divisors is an integer number (4925400).

Almost surely, 2^21015032 is an apocalyptic number.

It is an amenable number.

21015032 is a deficient number, since it is larger than the sum of its proper divisors (18388168).

21015032 is a wasteful number, since it uses less digits than its factorization.

21015032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626885 (or 2626881 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21015032 is about 4584.2155272195. The cubic root of 21015032 is about 275.9582307441.

Adding to 21015032 its reverse (23051012), we get a palindrome (44066044).

The spelling of 21015032 in words is "twenty-one million, fifteen thousand, thirty-two".