21534342313012 has 12 divisors (see below), whose sum is σ = 37685438086660. Its totient is φ = 10767074288256.

The previous prime is 21534342313009. The next prime is 21534342313067. The reversal of 21534342313012 is 21031324343512.

It can be written as a sum of positive squares in 2 ways, for example, as 3833591697936 + 17700750615076 = 1957956^2 + 4207226^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23715723 + ... + 24606994.

Almost surely, 2^{21534342313012} is an apocalyptic number.

It is an amenable number.

21534342313012 is a deficient number, since it is larger than the sum of its proper divisors (16151095773648).

21534342313012 is a wasteful number, since it uses less digits than its factorization.

21534342313012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48434130 (or 48434128 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 21534342313012 its reverse (21031324343512), we get a palindrome (42565666656524).

The spelling of 21534342313012 in words is "twenty-one trillion, five hundred thirty-four billion, three hundred forty-two million, three hundred thirteen thousand, twelve".