221535442413 has 24 divisors (see below), whose sum is σ = 342546640800. Its totient is φ = 137545638624.

The previous prime is 221535442409. The next prime is 221535442417. The reversal of 221535442413 is 314244535122.

It is a happy number.

221535442413 is a `hidden beast` number, since 2 + 2 + 153 + 54 + 42 + 413 = 666.

It is an interprime number because it is at equal distance from previous prime (221535442409) and next prime (221535442417).

It is not a de Polignac number, because 221535442413 - 2² = 221535442409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221535442417) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10968970 + ... + 10989147.

It is an arithmetic number, because the mean of its divisors is an integer number (14272776700).

Almost surely, 2^221535442413 is an apocalyptic number.

It is an amenable number.

221535442413 is a deficient number, since it is larger than the sum of its proper divisors (121011198387).

221535442413 is a wasteful number, since it uses less digits than its factorization.

221535442413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21958201 (or 21958198 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 221535442413 its reverse (314244535122), we get a palindrome (535779977535).

The spelling of 221535442413 in words is "two hundred twenty-one billion, five hundred thirty-five million, four hundred forty-two thousand, four hundred thirteen".