135421445421 has 24 divisors (see below), whose sum is σ = 196945572096. Its totient is φ = 89666016000.

The previous prime is 135421445399. The next prime is 135421445431. The reversal of 135421445421 is 124544124531.

135421445421 is a `hidden beast` number, since 1 + 3 + 54 + 21 + 44 + 542 + 1 = 666.

It is not a de Polignac number, because 135421445421 - 2⁹ = 135421444909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135421445431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712516 + ... + 882338.

It is an arithmetic number, because the mean of its divisors is an integer number (8206065504).

Almost surely, 2^135421445421 is an apocalyptic number.

It is an amenable number.

135421445421 is a deficient number, since it is larger than the sum of its proper divisors (61524126675).

135421445421 is a wasteful number, since it uses less digits than its factorization.

135421445421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170433 (or 170430 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

Adding to 135421445421 its reverse (124544124531), we get a palindrome (259965569952).

The spelling of 135421445421 in words is "one hundred thirty-five billion, four hundred twenty-one million, four hundred forty-five thousand, four hundred twenty-one".