20121133110 has 64 divisors (see below), whose sum is σ = 53683015680. Its totient is φ = 4793120640.

The previous prime is 20121133103. The next prime is 20121133157. The reversal of 20121133110 is 1133112102.

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 20121133110.

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, 820050 + ... + 844229.

It is an arithmetic number, because the mean of its divisors is an integer number (838797120).

Almost surely, 2^20121133110 is an apocalyptic number.

20121133110 is an abundant number, since it is smaller than the sum of its proper divisors (33561882570).

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

20121133110 is a wasteful number, since it uses less digits than its factorization.

20121133110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664333.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20121133110 its reverse (1133112102), we get a palindrome (21254245212).

The spelling of 20121133110 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-three thousand, one hundred ten".