21040120324210 has 128 divisors (see below), whose sum is σ = 42848744843520. Its totient is φ = 7384137513984.

The previous prime is 21040120324193. The next prime is 21040120324229. The reversal of 21040120324210 is 1242302104012.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 410938332 + ... + 410989528.

It is an arithmetic number, because the mean of its divisors is an integer number (334755819090).

Almost surely, 2^{21040120324210} is an apocalyptic number.

21040120324210 is an abundant number, since it is smaller than the sum of its proper divisors (21808624519310).

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

21040120324210 is a wasteful number, since it uses less digits than its factorization.

21040120324210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52940.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21040120324210 its reverse (1242302104012), we get a palindrome (22282422428222).

The spelling of 21040120324210 in words is "twenty-one trillion, forty billion, one hundred twenty million, three hundred twenty-four thousand, two hundred ten".