31472021 has 8 divisors (see below), whose sum is σ = 36028800. Its totient is φ = 26930448.

The previous prime is 31472011. The next prime is 31472029. The reversal of 31472021 is 12027413.

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 31472021 - 2¹⁰ = 31470997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31471984 and 31472002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31472029) 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, 1055 + ... + 8003.

It is an arithmetic number, because the mean of its divisors is an integer number (4503600).

Almost surely, 2^31472021 is an apocalyptic number.

It is an amenable number.

31472021 is a deficient number, since it is larger than the sum of its proper divisors (4556779).

31472021 is an equidigital number, since it uses as much as digits as its factorization.

31472021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7603.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 31472021 is about 5609.9929589974. The cubic root of 31472021 is about 315.7244466686.

Adding to 31472021 its reverse (12027413), we get a palindrome (43499434).

The spelling of 31472021 in words is "thirty-one million, four hundred seventy-two thousand, twenty-one".