21424121210 has 16 divisors (see below), whose sum is σ = 38857797792. Its totient is φ = 8504230800.

The previous prime is 21424121203. The next prime is 21424121219. The reversal of 21424121210 is 1212142412.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21424121219) 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, 8175836 + ... + 8178455.

It is an arithmetic number, because the mean of its divisors is an integer number (2428612362).

Almost surely, 2^21424121210 is an apocalyptic number.

21424121210 is a deficient number, since it is larger than the sum of its proper divisors (17433676582).

21424121210 is a wasteful number, since it uses less digits than its factorization.

21424121210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16354429.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21424121210 its reverse (1212142412), we get a palindrome (22636263622).

The spelling of 21424121210 in words is "twenty-one billion, four hundred twenty-four million, one hundred twenty-one thousand, two hundred ten".