31442421 has 8 divisors (see below), whose sum is σ = 42513984. Its totient is φ = 20666240.

The previous prime is 31442419. The next prime is 31442431. The reversal of 31442421 is 12424413.

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 31442421 - 2¹ = 31442419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442431) 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, 73596 + ... + 74021.

It is an arithmetic number, because the mean of its divisors is an integer number (5314248).

Almost surely, 2^31442421 is an apocalyptic number.

It is an amenable number.

31442421 is a deficient number, since it is larger than the sum of its proper divisors (11071563).

31442421 is a wasteful number, since it uses less digits than its factorization.

31442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147691.

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

The square root of 31442421 is about 5607.3541889201. The cubic root of 31442421 is about 315.6254341202.

Adding to 31442421 its reverse (12424413), we get a palindrome (43866834).

It can be divided in two parts, 3144 and 2421, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 31442421 in words is "thirty-one million, four hundred forty-two thousand, four hundred twenty-one".