21322270 has 16 divisors (see below), whose sum is σ = 38466000. Its totient is φ = 8509824.

The previous prime is 21322241. The next prime is 21322277. The reversal of 21322270 is 7222312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322277) 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, 2854 + ... + 7126.

It is an arithmetic number, because the mean of its divisors is an integer number (2404125).

Almost surely, 2^21322270 is an apocalyptic number.

21322270 is a deficient number, since it is larger than the sum of its proper divisors (17143730).

21322270 is a wasteful number, since it uses less digits than its factorization.

21322270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4779.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21322270 is about 4617.6043572398. The cubic root of 21322270 is about 277.2965584071.

Adding to 21322270 its reverse (7222312), we get a palindrome (28544582).

The spelling of 21322270 in words is "twenty-one million, three hundred twenty-two thousand, two hundred seventy".