31424421 has 16 divisors (see below), whose sum is σ = 49430528. Its totient is φ = 17377200.

The previous prime is 31424401. The next prime is 31424467. The reversal of 31424421 is 12442413.

It is not a de Polignac number, because 31424421 - 2⁷ = 31424293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31424401) 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 15 ways as a sum of consecutive naturals, for example, 23485 + ... + 24786.

It is an arithmetic number, because the mean of its divisors is an integer number (3089408).

Almost surely, 2^31424421 is an apocalyptic number.

31424421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31424421 is a deficient number, since it is larger than the sum of its proper divisors (18006107).

31424421 is a wasteful number, since it uses less digits than its factorization.

31424421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48312.

The product of its digits is 768, while the sum is 21.

The square root of 31424421 is about 5605.7489240957. The cubic root of 31424421 is about 315.5651933997.

Adding to 31424421 its reverse (12442413), we get a palindrome (43866834).

The spelling of 31424421 in words is "thirty-one million, four hundred twenty-four thousand, four hundred twenty-one".