612143115421 has 4 divisors (see below), whose sum is σ = 613482597532. Its totient is φ = 610803633312.

The previous prime is 612143115383. The next prime is 612143115427. The reversal of 612143115421 is 124511341216.

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 528835838521 + 83307276900 = 727211^2 + 288630^2 .

It is a cyclic number.

It is not a de Polignac number, because 612143115421 - 2⁷ = 612143115293 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 (612143115427) 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, 669740370 + ... + 669741283.

It is an arithmetic number, because the mean of its divisors is an integer number (153370649383).

Almost surely, 2^612143115421 is an apocalyptic number.

It is an amenable number.

612143115421 is a deficient number, since it is larger than the sum of its proper divisors (1339482111).

612143115421 is a wasteful number, since it uses less digits than its factorization.

612143115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339482110.

The product of its digits is 5760, while the sum is 31.

Adding to 612143115421 its reverse (124511341216), we get a palindrome (736654456637).

The spelling of 612143115421 in words is "six hundred twelve billion, one hundred forty-three million, one hundred fifteen thousand, four hundred twenty-one".