21532030 has 32 divisors (see below), whose sum is σ = 44198784. Its totient is φ = 7481856.

The previous prime is 21532019. The next prime is 21532031. The reversal of 21532030 is 3023512.

It is a junction number, because it is equal to n+sod(n) for n = 21531995 and 21532013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532031) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 2662 + ... + 7081.

It is an arithmetic number, because the mean of its divisors is an integer number (1381212).

Almost surely, 2^21532030 is an apocalyptic number.

21532030 is an abundant number, since it is smaller than the sum of its proper divisors (22666754).

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

21532030 is a wasteful number, since it uses less digits than its factorization.

21532030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9780.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21532030 is about 4640.2618460600. The cubic root of 21532030 is about 278.2029038175.

Adding to 21532030 its reverse (3023512), we get a palindrome (24555542).

The spelling of 21532030 in words is "twenty-one million, five hundred thirty-two thousand, thirty".