21030431423234 has 8 divisors (see below), whose sum is σ = 31546212707340. Its totient is φ = 10515027187456.

The previous prime is 21030431423233. The next prime is 21030431423257. The reversal of 21030431423234 is 43232413403012.

It can be written as a sum of positive squares in 2 ways, for example, as 15083490760009 + 5946940663225 = 3883747^2 + 2438635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21030431423234.

It is not an unprimeable number, because it can be changed into a prime (21030431423233) 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, 94122599 + ... + 94345770.

Almost surely, 2^{21030431423234} is an apocalyptic number.

21030431423234 is a deficient number, since it is larger than the sum of its proper divisors (10515781284106).

21030431423234 is a wasteful number, since it uses less digits than its factorization.

21030431423234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188524164.

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 21030431423234 its reverse (43232413403012), we get a palindrome (64262844826246).

The spelling of 21030431423234 in words is "twenty-one trillion, thirty billion, four hundred thirty-one million, four hundred twenty-three thousand, two hundred thirty-four".