31021423 has 8 divisors (see below), whose sum is σ = 31553600. Its totient is φ = 30492288.

The previous prime is 31021399. The next prime is 31021427. The reversal of 31021423 is 32412013.

It is a happy number.

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 31021423 - 2¹⁷ = 30890351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31021397 and 31021406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021427) 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, 29338 + ... + 30376.

It is an arithmetic number, because the mean of its divisors is an integer number (3944200).

Almost surely, 2^31021423 is an apocalyptic number.

31021423 is a deficient number, since it is larger than the sum of its proper divisors (532177).

31021423 is a wasteful number, since it uses less digits than its factorization.

31021423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31021423 is about 5569.6878727627. The cubic root of 31021423 is about 314.2104117997.

Adding to 31021423 its reverse (32412013), we get a palindrome (63433436).

The spelling of 31021423 in words is "thirty-one million, twenty-one thousand, four hundred twenty-three".