31028421 has 8 divisors (see below), whose sum is σ = 41406400. Its totient is φ = 20668032.

The previous prime is 31028411. The next prime is 31028447. The reversal of 31028421 is 12482013.

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

It is not a de Polignac number, because 31028421 - 2²² = 26834117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31028401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (5175800).

Almost surely, 2^31028421 is an apocalyptic number.

It is an amenable number.

31028421 is a deficient number, since it is larger than the sum of its proper divisors (10377979).

31028421 is a wasteful number, since it uses less digits than its factorization.

31028421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8795.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31028421 is about 5570.3160592555. The cubic root of 31028421 is about 314.2340371842.

The spelling of 31028421 in words is "thirty-one million, twenty-eight thousand, four hundred twenty-one".