124135531421 has 4 divisors (see below), whose sum is σ = 135420579744. Its totient is φ = 112850483100.

The previous prime is 124135531319. The next prime is 124135531423.

124135531421 is nontrivially palindromic in base 10.

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 124135531421 - 2³⁰ = 123061789597 is a prime.

It is a super-2 number, since 2×124135531421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124135531423) 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, 5642524145 + ... + 5642524166.

It is an arithmetic number, because the mean of its divisors is an integer number (33855144936).

Almost surely, 2^124135531421 is an apocalyptic number.

124135531421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

124135531421 is a deficient number, since it is larger than the sum of its proper divisors (11285048323).

124135531421 is a wasteful number, since it uses less digits than its factorization.

124135531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11285048322.

The product of its digits is 14400, while the sum is 32.

It can be divided in two parts, 124135 and 531421, that added together give a palindrome (655556).

The spelling of 124135531421 in words is "one hundred twenty-four billion, one hundred thirty-five million, five hundred thirty-one thousand, four hundred twenty-one".