2131121243029 has 4 divisors (see below), whose sum is σ = 2131127487820. Its totient is φ = 2131114998240.

The previous prime is 2131121242997. The next prime is 2131121243039. The reversal of 2131121243029 is 9203421211312.

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 789921000625 + 1341200242404 = 888775^2 + 1158102^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131121243029 - 2⁵ = 2131121242997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131121243039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2578974 + ... + 3303535.

It is an arithmetic number, because the mean of its divisors is an integer number (532781871955).

Almost surely, 2^{2131121243029} is an apocalyptic number.

It is an amenable number.

2131121243029 is a deficient number, since it is larger than the sum of its proper divisors (6244791).

2131121243029 is an equidigital number, since it uses as much as digits as its factorization.

2131121243029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6244790.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 2131121243029 in words is "two trillion, one hundred thirty-one billion, one hundred twenty-one million, two hundred forty-three thousand, twenty-nine".