221531241413 has 16 divisors (see below), whose sum is σ = 231296361984. Its totient is φ = 211975600320.

The previous prime is 221531241409. The next prime is 221531241419. The reversal of 221531241413 is 314142135122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221531241413 - 2² = 221531241409 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 (221531241419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1431143 + ... + 1578363.

It is an arithmetic number, because the mean of its divisors is an integer number (14456022624).

Almost surely, 2^221531241413 is an apocalyptic number.

It is an amenable number.

221531241413 is a deficient number, since it is larger than the sum of its proper divisors (9765120571).

221531241413 is a wasteful number, since it uses less digits than its factorization.

221531241413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147932.

The product of its digits is 5760, while the sum is 29.

Adding to 221531241413 its reverse (314142135122), we get a palindrome (535673376535).

The spelling of 221531241413 in words is "two hundred twenty-one billion, five hundred thirty-one million, two hundred forty-one thousand, four hundred thirteen".