4012131121021 has 4 divisors (see below), whose sum is σ = 4012223242972. Its totient is φ = 4012038999072.

The previous prime is 4012131120997. The next prime is 4012131121049. The reversal of 4012131121021 is 1201211312104.

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 657412856100 + 3354718264921 = 810810^2 + 1831589^2 .

It is a cyclic number.

It is not a de Polignac number, because 4012131121021 - 2²⁹ = 4011594250109 is a prime.

It is a super-2 number, since 2×4012131121021² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4012131121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4012131125021) 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, 45995616 + ... + 46082761.

It is an arithmetic number, because the mean of its divisors is an integer number (1003055810743).

Almost surely, 2^{4012131121021} is an apocalyptic number.

It is an amenable number.

4012131121021 is a deficient number, since it is larger than the sum of its proper divisors (92121951).

4012131121021 is an equidigital number, since it uses as much as digits as its factorization.

4012131121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92121950.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 4012131121021 its reverse (1201211312104), we get a palindrome (5213342433125).

The spelling of 4012131121021 in words is "four trillion, twelve billion, one hundred thirty-one million, one hundred twenty-one thousand, twenty-one".