21532010 has 8 divisors (see below), whose sum is σ = 38757636. Its totient is φ = 8612800.

The previous prime is 21531989. The next prime is 21532019. The reversal of 21532010 is 1023512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21446161 + 85849 = 4631^2 + 293^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21532019) by changing a digit.

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, 1076591 + ... + 1076610.

Almost surely, 2^21532010 is an apocalyptic number.

21532010 is a deficient number, since it is larger than the sum of its proper divisors (17225626).

21532010 is a wasteful number, since it uses less digits than its factorization.

21532010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153208.

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

The square root of 21532010 is about 4640.2596910087. The cubic root of 21532010 is about 278.2028176814.

Adding to 21532010 its reverse (1023512), we get a palindrome (22555522).

The spelling of 21532010 in words is "twenty-one million, five hundred thirty-two thousand, ten".