421145241125531 has 6 divisors (see below), whose sum is σ = 456033012579900. Its totient is φ = 388749453346488.

The previous prime is 421145241125447. The next prime is 421145241125551. The reversal of 421145241125531 is 135521142541124.

It is a de Polignac number, because none of the positive numbers 2^k-421145241125531 is a prime.

It is a super-2 number, since 2×421145241125531² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421145241125551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1245991837481 + ... + 1245991837818.

It is an arithmetic number, because the mean of its divisors is an integer number (76005502096650).

Almost surely, 2^{421145241125531} is an apocalyptic number.

421145241125531 is a deficient number, since it is larger than the sum of its proper divisors (34887771454369).

421145241125531 is a wasteful number, since it uses less digits than its factorization.

421145241125531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491983675325 (or 2491983675312 counting only the distinct ones).

The product of its digits is 192000, while the sum is 41.

Adding to 421145241125531 its reverse (135521142541124), we get a palindrome (556666383666655).

The spelling of 421145241125531 in words is "four hundred twenty-one trillion, one hundred forty-five billion, two hundred forty-one million, one hundred twenty-five thousand, five hundred thirty-one".