1237242539221 has 4 divisors (see below), whose sum is σ = 1332415042252. Its totient is φ = 1142070036192.

The previous prime is 1237242539213. The next prime is 1237242539279. The reversal of 1237242539221 is 1229352427321.

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 235719960100 + 1001522579121 = 485510^2 + 1000761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1237242539221 - 2³ = 1237242539213 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 (1237242530221) 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, 47586251496 + ... + 47586251521.

It is an arithmetic number, because the mean of its divisors is an integer number (333103760563).

Almost surely, 2^{1237242539221} is an apocalyptic number.

It is an amenable number.

1237242539221 is a deficient number, since it is larger than the sum of its proper divisors (95172503031).

1237242539221 is an equidigital number, since it uses as much as digits as its factorization.

1237242539221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95172503030.

The product of its digits is 362880, while the sum is 43.

The spelling of 1237242539221 in words is "one trillion, two hundred thirty-seven billion, two hundred forty-two million, five hundred thirty-nine thousand, two hundred twenty-one".