21423414031 has 4 divisors (see below), whose sum is σ = 21424864552. Its totient is φ = 21421963512.

The previous prime is 21423414029. The next prime is 21423414041. The reversal of 21423414031 is 13041432412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21423414031 - 2¹ = 21423414029 is a prime.

It is a super-2 number, since 2×21423414031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21423413987 and 21423414005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423414011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702876 + ... + 732721.

It is an arithmetic number, because the mean of its divisors is an integer number (5356216138).

Almost surely, 2^21423414031 is an apocalyptic number.

21423414031 is a deficient number, since it is larger than the sum of its proper divisors (1450521).

21423414031 is a wasteful number, since it uses less digits than its factorization.

21423414031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450520.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21423414031 its reverse (13041432412), we get a palindrome (34464846443).

The spelling of 21423414031 in words is "twenty-one billion, four hundred twenty-three million, four hundred fourteen thousand, thirty-one".