21490532 has 24 divisors (see below), whose sum is σ = 43080576. Its totient is φ = 9188928.

The previous prime is 21490531. The next prime is 21490541. The reversal of 21490532 is 23509412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490531) 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, 20288 + ... + 21320.

It is an arithmetic number, because the mean of its divisors is an integer number (1795024).

Almost surely, 2^21490532 is an apocalyptic number.

It is an amenable number.

21490532 is an abundant number, since it is smaller than the sum of its proper divisors (21590044).

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

21490532 is a wasteful number, since it uses less digits than its factorization.

21490532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787 (or 1785 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21490532 is about 4635.7881746258. The cubic root of 21490532 is about 278.0240649940.

Adding to 21490532 its reverse (23509412), we get a palindrome (44999944).

It can be divided in two parts, 21490 and 532, that added together give a palindrome (22022).

The spelling of 21490532 in words is "twenty-one million, four hundred ninety thousand, five hundred thirty-two".