21412570 has 8 divisors (see below), whose sum is σ = 38542644. Its totient is φ = 8565024.

The previous prime is 21412561. The next prime is 21412577. The reversal of 21412570 is 7521412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19421649 + 1990921 = 4407^2 + 1411^2 .

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 (21412577) 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, 1070619 + ... + 1070638.

Almost surely, 2^21412570 is an apocalyptic number.

21412570 is a deficient number, since it is larger than the sum of its proper divisors (17130074).

21412570 is a wasteful number, since it uses less digits than its factorization.

21412570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141264.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21412570 is about 4627.3718242648. The cubic root of 21412570 is about 277.6874582209.

Adding to 21412570 its reverse (7521412), we get a palindrome (28933982).

The spelling of 21412570 in words is "twenty-one million, four hundred twelve thousand, five hundred seventy".