31003040421 has 6 divisors (see below), whose sum is σ = 44782169510. Its totient is φ = 20668693608.

The previous prime is 31003040413. The next prime is 31003040443. The reversal of 31003040421 is 12404030013.

It can be written as a sum of positive squares in only one way, i.e., 21994373025 + 9008667396 = 148305^2 + 94914^2 .

It is not a de Polignac number, because 31003040421 - 2³ = 31003040413 is a prime.

It is a super-2 number, since 2×31003040421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31003040394 and 31003040403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003040021) 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, 1722391126 + ... + 1722391143.

Almost surely, 2^31003040421 is an apocalyptic number.

It is an amenable number.

31003040421 is a deficient number, since it is larger than the sum of its proper divisors (13779129089).

31003040421 is a wasteful number, since it uses less digits than its factorization.

31003040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444782275 (or 3444782272 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31003040421 its reverse (12404030013), we get a palindrome (43407070434).

The spelling of 31003040421 in words is "thirty-one billion, three million, forty thousand, four hundred twenty-one".