21312004340340 has 144 divisors (see below), whose sum is σ = 74984326015872. Its totient is φ = 4798609060608.

The previous prime is 21312004340327. The next prime is 21312004340369. The reversal of 21312004340340 is 4304340021312.

21312004340340 is a `hidden beast` number, since 2 + 1 + 312 + 0 + 0 + 4 + 3 + 4 + 0 + 340 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 126141619 + ... + 126310458.

Almost surely, 2^{21312004340340} is an apocalyptic number.

21312004340340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312004340340 is an abundant number, since it is smaller than the sum of its proper divisors (53672321675532).

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

21312004340340 is a wasteful number, since it uses less digits than its factorization.

21312004340340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252452166 (or 252452161 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21312004340340 its reverse (4304340021312), we get a palindrome (25616344361652).

The spelling of 21312004340340 in words is "twenty-one trillion, three hundred twelve billion, four million, three hundred forty thousand, three hundred forty".