2051121172120 has 128 divisors (see below), whose sum is σ = 4807717156800. Its totient is φ = 786604621824.

The previous prime is 2051121172109. The next prime is 2051121172151. The reversal of 2051121172120 is 212711211502.

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, 126036304 + ... + 126052576.

Almost surely, 2^{2051121172120} is an apocalyptic number.

2051121172120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2051121172120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2403858578400).

2051121172120 is an abundant number, since it is smaller than the sum of its proper divisors (2756595984680).

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

2051121172120 is a wasteful number, since it uses less digits than its factorization.

2051121172120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17069 (or 17065 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 2051121172120 its reverse (212711211502), we get a palindrome (2263832383622).

The spelling of 2051121172120 in words is "two trillion, fifty-one billion, one hundred twenty-one million, one hundred seventy-two thousand, one hundred twenty".