21232070 has 16 divisors (see below), whose sum is σ = 38283840. Its totient is φ = 8478144.

The previous prime is 21232049. The next prime is 21232073. The reversal of 21232070 is 7023212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232073) 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, 5714 + ... + 8666.

It is an arithmetic number, because the mean of its divisors is an integer number (2392740).

Almost surely, 2^21232070 is an apocalyptic number.

21232070 is a deficient number, since it is larger than the sum of its proper divisors (17051770).

21232070 is a wasteful number, since it uses less digits than its factorization.

21232070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21232070 is about 4607.8270366844. The cubic root of 21232070 is about 276.9049881149.

Adding to 21232070 its reverse (7023212), we get a palindrome (28255282).

The spelling of 21232070 in words is "twenty-one million, two hundred thirty-two thousand, seventy".