40145042421 has 48 divisors (see below), whose sum is σ = 67824697920. Its totient is φ = 23272397280.

The previous prime is 40145042407. The next prime is 40145042447. The reversal of 40145042421 is 12424054104.

It is not a de Polignac number, because 40145042421 - 2¹⁰ = 40145041397 is a prime.

It is a super-2 number, since 2×40145042421² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40145142421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29355 + ... + 284871.

It is an arithmetic number, because the mean of its divisors is an integer number (1413014540).

Almost surely, 2^40145042421 is an apocalyptic number.

It is an amenable number.

40145042421 is a deficient number, since it is larger than the sum of its proper divisors (27679655499).

40145042421 is a wasteful number, since it uses less digits than its factorization.

40145042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255583 (or 255554 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 40145042421 its reverse (12424054104), we get a palindrome (52569096525).

The spelling of 40145042421 in words is "forty billion, one hundred forty-five million, forty-two thousand, four hundred twenty-one".