13555430421 has 16 divisors (see below), whose sum is σ = 19466958336. Its totient is φ = 8340624576.

The previous prime is 13555430387. The next prime is 13555430453. The reversal of 13555430421 is 12403455531.

It is a de Polignac number, because none of the positive numbers 2^k-13555430421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555430491) 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, 314076 + ... + 354618.

It is an arithmetic number, because the mean of its divisors is an integer number (1216684896).

Almost surely, 2^13555430421 is an apocalyptic number.

It is an amenable number.

13555430421 is a deficient number, since it is larger than the sum of its proper divisors (5911527915).

13555430421 is a wasteful number, since it uses less digits than its factorization.

13555430421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49132.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 13555430421 its reverse (12403455531), we get a palindrome (25958885952).

The spelling of 13555430421 in words is "thirteen billion, five hundred fifty-five million, four hundred thirty thousand, four hundred twenty-one".