21232870 has 16 divisors (see below), whose sum is σ = 38277648. Its totient is φ = 8480160.

The previous prime is 21232867. The next prime is 21232879. The reversal of 21232870 is 7823212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232879) 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, 7900 + ... + 10240.

It is an arithmetic number, because the mean of its divisors is an integer number (2392353).

Almost surely, 2^21232870 is an apocalyptic number.

21232870 is a deficient number, since it is larger than the sum of its proper divisors (17044778).

21232870 is a wasteful number, since it uses less digits than its factorization.

21232870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21232870 is about 4607.9138446807. The cubic root of 21232870 is about 276.9084658918.

The spelling of 21232870 in words is "twenty-one million, two hundred thirty-two thousand, eight hundred seventy".