21343140312 has 64 divisors (see below), whose sum is σ = 57479194080. Its totient is φ = 6565189632.

The previous prime is 21343140281. The next prime is 21343140317. The reversal of 21343140312 is 21304134312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343140317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345258 + ... + 1361030.

Almost surely, 2^21343140312 is an apocalyptic number.

It is an amenable number.

21343140312 is an abundant number, since it is smaller than the sum of its proper divisors (36136053768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343140312 is a wasteful number, since it uses less digits than its factorization.

21343140312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20132 (or 20128 counting only the distinct ones).

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

Adding to 21343140312 its reverse (21304134312), we get a palindrome (42647274624).

The spelling of 21343140312 in words is "twenty-one billion, three hundred forty-three million, one hundred forty thousand, three hundred twelve".