21465223312340 has 12 divisors (see below), whose sum is σ = 45076968955956. Its totient is φ = 8586089324928.

The previous prime is 21465223312319. The next prime is 21465223312387. The reversal of 21465223312340 is 4321332256412.

It can be written as a sum of positive squares in 2 ways, for example, as 2325490801936 + 19139732510404 = 1524956^2 + 4374898^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21465223312294 and 21465223312303.

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, 536630582789 + ... + 536630582828.

It is an arithmetic number, because the mean of its divisors is an integer number (3756414079663).

Almost surely, 2^{21465223312340} is an apocalyptic number.

21465223312340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21465223312340 is an abundant number, since it is smaller than the sum of its proper divisors (23611745643616).

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

21465223312340 is a wasteful number, since it uses less digits than its factorization.

21465223312340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073261165626 (or 1073261165624 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 21465223312340 its reverse (4321332256412), we get a palindrome (25786555568752).

The spelling of 21465223312340 in words is "twenty-one trillion, four hundred sixty-five billion, two hundred twenty-three million, three hundred twelve thousand, three hundred forty".