31003421 has 8 divisors (see below), whose sum is σ = 33432000. Its totient is φ = 28654560.

The previous prime is 31003397. The next prime is 31003439. The reversal of 31003421 is 12430013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31003421 - 2¹⁰ = 31002397 is a prime.

It is a super-2 number, since 2×31003421² = 1922424227406482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31003396 and 31003405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19121 + ... + 20678.

It is an arithmetic number, because the mean of its divisors is an integer number (4179000).

Almost surely, 2^31003421 is an apocalyptic number.

It is an amenable number.

31003421 is a deficient number, since it is larger than the sum of its proper divisors (2428579).

31003421 is a wasteful number, since it uses less digits than its factorization.

31003421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39859.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31003421 is about 5568.0715692239. The cubic root of 31003421 is about 314.1496203659.

Adding to 31003421 its reverse (12430013), we get a palindrome (43433434).

The spelling of 31003421 in words is "thirty-one million, three thousand, four hundred twenty-one".