21032770 has 32 divisors (see below), whose sum is σ = 41492736. Its totient is φ = 7612800.

The previous prime is 21032731. The next prime is 21032773. The reversal of 21032770 is 7723012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21032773) 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 15 ways as a sum of consecutive naturals, for example, 40110 + ... + 40630.

It is an arithmetic number, because the mean of its divisors is an integer number (1296648).

Almost surely, 2^21032770 is an apocalyptic number.

21032770 is a deficient number, since it is larger than the sum of its proper divisors (20459966).

21032770 is a wasteful number, since it uses less digits than its factorization.

21032770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 21032770 is about 4586.1498013039. The cubic root of 21032770 is about 276.0358509055.

Adding to 21032770 its reverse (7723012), we get a palindrome (28755782).

The spelling of 21032770 in words is "twenty-one million, thirty-two thousand, seven hundred seventy".