21026532 has 12 divisors (see below), whose sum is σ = 49061936. Its totient is φ = 7008840.

The previous prime is 21026519. The next prime is 21026549. The reversal of 21026532 is 23562012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21026499 and 21026508.

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 in 3 ways as a sum of consecutive naturals, for example, 876094 + ... + 876117.

Almost surely, 2^21026532 is an apocalyptic number.

It is an amenable number.

21026532 is an abundant number, since it is smaller than the sum of its proper divisors (28035404).

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

21026532 is a wasteful number, since it uses less digits than its factorization.

21026532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752218 (or 1752216 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21026532 is about 4585.4696596968. The cubic root of 21026532 is about 276.0085588608.

Adding to 21026532 its reverse (23562012), we get a palindrome (44588544).

The spelling of 21026532 in words is "twenty-one million, twenty-six thousand, five hundred thirty-two".