21323010 has 32 divisors (see below), whose sum is σ = 51321600. Its totient is φ = 5669888.

The previous prime is 21322999. The next prime is 21323011. The reversal of 21323010 is 1032312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21323011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12679 + ... + 14261.

It is an arithmetic number, because the mean of its divisors is an integer number (1603800).

Almost surely, 2^21323010 is an apocalyptic number.

21323010 is an abundant number, since it is smaller than the sum of its proper divisors (29998590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323010 is a wasteful number, since it uses less digits than its factorization.

21323010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21323010 is about 4617.6844846741. The cubic root of 21323010 is about 277.2997662750.

Adding to 21323010 its reverse (1032312), we get a palindrome (22355322).

The spelling of 21323010 in words is "twenty-one million, three hundred twenty-three thousand, ten".