42221431 has 16 divisors (see below), whose sum is σ = 49851648. Its totient is φ = 35006400.

The previous prime is 42221407. The next prime is 42221437. The reversal of 42221431 is 13412224.

It is a cyclic number.

It is not a de Polignac number, because 42221431 - 2¹¹ = 42219383 is a prime.

It is a super-2 number, since 2×42221431² = 3565298471375522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42221399 and 42221408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42221437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37036 + ... + 38158.

It is an arithmetic number, because the mean of its divisors is an integer number (3115728).

Almost surely, 2^42221431 is an apocalyptic number.

42221431 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

42221431 is a deficient number, since it is larger than the sum of its proper divisors (7630217).

42221431 is a wasteful number, since it uses less digits than its factorization.

42221431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

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

The square root of 42221431 is about 6497.8020129887. The cubic root of 42221431 is about 348.2124671408.

Adding to 42221431 its reverse (13412224), we get a palindrome (55633655).

The spelling of 42221431 in words is "forty-two million, two hundred twenty-one thousand, four hundred thirty-one".