2051551200121 has 4 divisors (see below), whose sum is σ = 2106998529892. Its totient is φ = 1996103870352.

The previous prime is 2051551200119. The next prime is 2051551200169. The reversal of 2051551200121 is 1210021551502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1189975539600 + 861575660521 = 1090860^2 + 928211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051551200121 - 2¹ = 2051551200119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2051551800121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27723664830 + ... + 27723664903.

It is an arithmetic number, because the mean of its divisors is an integer number (526749632473).

Almost surely, 2^{2051551200121} is an apocalyptic number.

It is an amenable number.

2051551200121 is a deficient number, since it is larger than the sum of its proper divisors (55447329771).

2051551200121 is an equidigital number, since it uses as much as digits as its factorization.

2051551200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55447329770.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 2051551200121 its reverse (1210021551502), we get a palindrome (3261572751623).

The spelling of 2051551200121 in words is "two trillion, fifty-one billion, five hundred fifty-one million, two hundred thousand, one hundred twenty-one".