20011111221010 has 64 divisors (see below), whose sum is σ = 44389660476672. Its totient is φ = 6324993628416.

The previous prime is 20011111220987. The next prime is 20011111221029. The reversal of 20011111221010 is 1012211111002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13520524 + ... + 14927383.

It is an arithmetic number, because the mean of its divisors is an integer number (693588444948).

Almost surely, 2^{20011111221010} is an apocalyptic number.

20011111221010 is an abundant number, since it is smaller than the sum of its proper divisors (24378549255662).

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

20011111221010 is a wasteful number, since it uses less digits than its factorization.

20011111221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28448707.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20011111221010 its reverse (1012211111002), we get a palindrome (21023322332012).

The spelling of 20011111221010 in words is "twenty trillion, eleven billion, one hundred eleven million, two hundred twenty-one thousand, ten".