2105121050451 has 20 divisors (see below), whose sum is σ = 3172516103592. Its totient is φ = 1390994434368.

The previous prime is 2105121050443. The next prime is 2105121050467. The reversal of 2105121050451 is 1540501215012.

It is a happy number.

2105121050451 is a `hidden beast` number, since 2 + 1 + 0 + 512 + 105 + 0 + 45 + 1 = 666.

It is not a de Polignac number, because 2105121050451 - 2³ = 2105121050443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2105121050251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 114987081 + ... + 115005386.

Almost surely, 2^{2105121050451} is an apocalyptic number.

2105121050451 is a deficient number, since it is larger than the sum of its proper divisors (1067395053141).

2105121050451 is a wasteful number, since it uses less digits than its factorization.

2105121050451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229992592 (or 229992583 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 2105121050451 its reverse (1540501215012), we get a palindrome (3645622265463).

The spelling of 2105121050451 in words is "two trillion, one hundred five billion, one hundred twenty-one million, fifty thousand, four hundred fifty-one".