21073570 has 16 divisors (see below), whose sum is σ = 43351488. Its totient is φ = 7225200.

The previous prime is 21073553. The next prime is 21073571. The reversal of 21073570 is 7537012.

It is not an unprimeable number, because it can be changed into a prime (21073571) 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, 150456 + ... + 150595.

It is an arithmetic number, because the mean of its divisors is an integer number (2709468).

Almost surely, 2^21073570 is an apocalyptic number.

21073570 is an abundant number, since it is smaller than the sum of its proper divisors (22277918).

21073570 is a wasteful number, since it uses less digits than its factorization.

21073570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301065.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 21073570 is about 4590.5958218950. The cubic root of 21073570 is about 276.2142231672.

The spelling of 21073570 in words is "twenty-one million, seventy-three thousand, five hundred seventy".