20001321210 has 64 divisors (see below), whose sum is σ = 53363358720. Its totient is φ = 4764579840.

The previous prime is 20001321181. The next prime is 20001321229. The reversal of 20001321210 is 1212310002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 815095 + ... + 839274.

It is an arithmetic number, because the mean of its divisors is an integer number (833802480).

Almost surely, 2^20001321210 is an apocalyptic number.

20001321210 is an abundant number, since it is smaller than the sum of its proper divisors (33362037510).

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

20001321210 is a wasteful number, since it uses less digits than its factorization.

20001321210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654423.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20001321210 its reverse (1212310002), we get a palindrome (21213631212).

The spelling of 20001321210 in words is "twenty billion, one million, three hundred twenty-one thousand, two hundred ten".