21532526 has 4 divisors (see below), whose sum is σ = 32298792. Its totient is φ = 10766262.

The previous prime is 21532519. The next prime is 21532541. The reversal of 21532526 is 62523512.

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

It is a junction number, because it is equal to n+sod(n) for n = 21532495 and 21532504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5383130 + ... + 5383133.

It is an arithmetic number, because the mean of its divisors is an integer number (8074698).

Almost surely, 2^21532526 is an apocalyptic number.

21532526 is a deficient number, since it is larger than the sum of its proper divisors (10766266).

21532526 is a wasteful number, since it uses less digits than its factorization.

21532526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766265.

The product of its digits is 3600, while the sum is 26.

The square root of 21532526 is about 4640.3152910120. The cubic root of 21532526 is about 278.2050399775.

The spelling of 21532526 in words is "twenty-one million, five hundred thirty-two thousand, five hundred twenty-six".