21232570 has 8 divisors (see below), whose sum is σ = 38218644. Its totient is φ = 8493024.

The previous prime is 21232531. The next prime is 21232571. The reversal of 21232570 is 7523212.

It can be written as a sum of positive squares in 2 ways, for example, as 20985561 + 247009 = 4581^2 + 497^2 .

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 (21232571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061619 + ... + 1061638.

Almost surely, 2^21232570 is an apocalyptic number.

21232570 is a deficient number, since it is larger than the sum of its proper divisors (16986074).

21232570 is a wasteful number, since it uses less digits than its factorization.

21232570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123264.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21232570 is about 4607.8812918737. The cubic root of 21232570 is about 276.9071617357.

Adding to 21232570 its reverse (7523212), we get a palindrome (28755782).

The spelling of 21232570 in words is "twenty-one million, two hundred thirty-two thousand, five hundred seventy".