31422421 has 4 divisors (see below), whose sum is σ = 31490752. Its totient is φ = 31354092.

The previous prime is 31422403. The next prime is 31422463. The reversal of 31422421 is 12422413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12422413 = 31 ⋅400723.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31422421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31422401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33471 + ... + 34396.

It is an arithmetic number, because the mean of its divisors is an integer number (7872688).

Almost surely, 2^31422421 is an apocalyptic number.

It is an amenable number.

31422421 is a deficient number, since it is larger than the sum of its proper divisors (68331).

31422421 is an equidigital number, since it uses as much as digits as its factorization.

31422421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68330.

The product of its digits is 384, while the sum is 19.

The square root of 31422421 is about 5605.5705329609. The cubic root of 31422421 is about 315.5584985665.

Adding to 31422421 its reverse (12422413), we get a palindrome (43844834).

The spelling of 31422421 in words is "thirty-one million, four hundred twenty-two thousand, four hundred twenty-one".