20111121121110 has 16 divisors (see below), whose sum is σ = 48266690690736. Its totient is φ = 5362965632288.

The previous prime is 20111121121097. The next prime is 20111121121121. The reversal of 20111121121110 is 1112112111102.

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 20111121121110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335185351989 + ... + 335185352048.

It is an arithmetic number, because the mean of its divisors is an integer number (3016668168171).

Almost surely, 2^{20111121121110} is an apocalyptic number.

20111121121110 is an abundant number, since it is smaller than the sum of its proper divisors (28155569569626).

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

20111121121110 is a wasteful number, since it uses less digits than its factorization.

20111121121110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670370704047.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 20111121121110 its reverse (1112112111102), we get a palindrome (21223233232212).

The spelling of 20111121121110 in words is "twenty trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred ten".