1242744472421 has 4 divisors (see below), whose sum is σ = 1251085039500. Its totient is φ = 1234403905344.

The previous prime is 1242744472399. The next prime is 1242744472433.

1242744472421 is nontrivially palindromic in base 10.

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 319394522500 + 923349949921 = 565150^2 + 960911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242744472421 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 (1242744474421) 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, 4170283316 + ... + 4170283613.

It is an arithmetic number, because the mean of its divisors is an integer number (312771259875).

Almost surely, 2^{1242744472421} is an apocalyptic number.

It is an amenable number.

1242744472421 is a deficient number, since it is larger than the sum of its proper divisors (8340567079).

1242744472421 is an equidigital number, since it uses as much as digits as its factorization.

1242744472421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340567078.

The product of its digits is 802816, while the sum is 44.

The spelling of 1242744472421 in words is "one trillion, two hundred forty-two billion, seven hundred forty-four million, four hundred seventy-two thousand, four hundred twenty-one".