531430120421 has 4 divisors (see below), whose sum is σ = 534949525344. Its totient is φ = 527910715500.

The previous prime is 531430120409. The next prime is 531430120427. The reversal of 531430120421 is 124021034135.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124021034135 = 5 ⋅24804206827.

It is a cyclic number.

It is not a de Polignac number, because 531430120421 - 2⁶ = 531430120357 is a prime.

It is a super-2 number, since 2×531430120421² (a number of 24 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 (531430120427) 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, 1759702235 + ... + 1759702536.

It is an arithmetic number, because the mean of its divisors is an integer number (133737381336).

Almost surely, 2^531430120421 is an apocalyptic number.

It is an amenable number.

531430120421 is a deficient number, since it is larger than the sum of its proper divisors (3519404923).

531430120421 is a wasteful number, since it uses less digits than its factorization.

531430120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519404922.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 531430120421 its reverse (124021034135), we get a palindrome (655451154556).

The spelling of 531430120421 in words is "five hundred thirty-one billion, four hundred thirty million, one hundred twenty thousand, four hundred twenty-one".