21423010 has 32 divisors (see below), whose sum is σ = 44232192. Its totient is φ = 7318080.

The previous prime is 21423007. The next prime is 21423019. The reversal of 21423010 is 1032412.

It is not an unprimeable number, because it can be changed into a prime (21423019) 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, 32080 + ... + 32740.

It is an arithmetic number, because the mean of its divisors is an integer number (1382256).

Almost surely, 2^21423010 is an apocalyptic number.

21423010 is an abundant number, since it is smaller than the sum of its proper divisors (22809182).

21423010 is a wasteful number, since it uses less digits than its factorization.

21423010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21423010 is about 4628.4997569407. The cubic root of 21423010 is about 277.7325810317.

Adding to 21423010 its reverse (1032412), we get a palindrome (22455422).

The spelling of 21423010 in words is "twenty-one million, four hundred twenty-three thousand, ten".