31440245421 has 16 divisors (see below), whose sum is σ = 47521019840. Its totient is φ = 18329535360.

The previous prime is 31440245413. The next prime is 31440245437. The reversal of 31440245421 is 12454204413.

It is not a de Polignac number, because 31440245421 - 2³ = 31440245413 is a prime.

It is a super-2 number, since 2×31440245421² (a number of 22 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 (31440245401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21214000 + ... + 21215481.

It is an arithmetic number, because the mean of its divisors is an integer number (2970063740).

Almost surely, 2^31440245421 is an apocalyptic number.

It is an amenable number.

31440245421 is a deficient number, since it is larger than the sum of its proper divisors (16080774419).

31440245421 is a wasteful number, since it uses less digits than its factorization.

31440245421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42429516.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 31440245421 its reverse (12454204413), we get a palindrome (43894449834).

The spelling of 31440245421 in words is "thirty-one billion, four hundred forty million, two hundred forty-five thousand, four hundred twenty-one".