21434123031 has 4 divisors (see below), whose sum is σ = 28578830712. Its totient is φ = 14289415352.

The previous prime is 21434123021. The next prime is 21434123063. The reversal of 21434123031 is 13032143412.

It is a happy number.

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 21434123031 - 2¹⁸ = 21433860887 is a prime.

It is a super-2 number, since 2×21434123031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21434122992 and 21434123010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434123021) 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, 3572353836 + ... + 3572353841.

It is an arithmetic number, because the mean of its divisors is an integer number (7144707678).

Almost surely, 2^21434123031 is an apocalyptic number.

21434123031 is a deficient number, since it is larger than the sum of its proper divisors (7144707681).

21434123031 is an equidigital number, since it uses as much as digits as its factorization.

21434123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144707680.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21434123031 its reverse (13032143412), we get a palindrome (34466266443).

The spelling of 21434123031 in words is "twenty-one billion, four hundred thirty-four million, one hundred twenty-three thousand, thirty-one".