21312430044134 has 4 divisors (see below), whose sum is σ = 31968645066204. Its totient is φ = 10656215022066.

The previous prime is 21312430044097. The next prime is 21312430044137. The reversal of 21312430044134 is 43144003421312.

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

It is a super-2 number, since 2×21312430044134² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21312430044134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312430044137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328107511032 + ... + 5328107511035.

It is an arithmetic number, because the mean of its divisors is an integer number (7992161266551).

Almost surely, 2^{21312430044134} is an apocalyptic number.

21312430044134 is a deficient number, since it is larger than the sum of its proper divisors (10656215022070).

21312430044134 is a wasteful number, since it uses less digits than its factorization.

21312430044134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656215022069.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21312430044134 its reverse (43144003421312), we get a palindrome (64456433465446).

The spelling of 21312430044134 in words is "twenty-one trillion, three hundred twelve billion, four hundred thirty million, forty-four thousand, one hundred thirty-four".