1352561437221 has 4 divisors (see below), whose sum is σ = 1803415249632. Its totient is φ = 901707624812.

The previous prime is 1352561437181. The next prime is 1352561437237. The reversal of 1352561437221 is 1227341652531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1352561437221 - 2¹³ = 1352561429029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1352561437421) 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, 225426906201 + ... + 225426906206.

It is an arithmetic number, because the mean of its divisors is an integer number (450853812408).

Almost surely, 2^{1352561437221} is an apocalyptic number.

It is an amenable number.

1352561437221 is a deficient number, since it is larger than the sum of its proper divisors (450853812411).

1352561437221 is an equidigital number, since it uses as much as digits as its factorization.

1352561437221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450853812410.

The product of its digits is 302400, while the sum is 42.

The spelling of 1352561437221 in words is "one trillion, three hundred fifty-two billion, five hundred sixty-one million, four hundred thirty-seven thousand, two hundred twenty-one".