21507464232324 has 216 divisors, whose sum is σ = 63845938473408. Its totient is φ = 6086586119040.

The previous prime is 21507464232323. The next prime is 21507464232389. The reversal of 21507464232324 is 42323246470512.

It is a happy number.

21507464232324 is a `hidden beast` number, since 2 + 1 + 50 + 7 + 46 + 4 + 232 + 324 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21507464232324.

It is not an unprimeable number, because it can be changed into a prime (21507464232323) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 83239414 + ... + 83497394.

It is an arithmetic number, because the mean of its divisors is an integer number (295583048488).

Almost surely, 2^{21507464232324} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21507464232324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31922969236704).

21507464232324 is an abundant number, since it is smaller than the sum of its proper divisors (42338474241084).

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

21507464232324 is a wasteful number, since it uses less digits than its factorization.

21507464232324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258455 (or 258443 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 45.

The spelling of 21507464232324 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty-four million, two hundred thirty-two thousand, three hundred twenty-four".