20111201212110 has 64 divisors (see below), whose sum is σ = 50440206339072. Its totient is φ = 5126813870976.

The previous prime is 20111201212049. The next prime is 20111201212121. The reversal of 20111201212110 is 1121210211102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20111201212110.

It is a congruent number.

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, 165791269 + ... + 165912528.

It is an arithmetic number, because the mean of its divisors is an integer number (788128224048).

Almost surely, 2^{20111201212110} is an apocalyptic number.

20111201212110 is an abundant number, since it is smaller than the sum of its proper divisors (30329005126962).

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

20111201212110 is a wasteful number, since it uses less digits than its factorization.

20111201212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331703897.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20111201212110 its reverse (1121210211102), we get a palindrome (21232411423212).

The spelling of 20111201212110 in words is "twenty trillion, one hundred eleven billion, two hundred one million, two hundred twelve thousand, one hundred ten".