21239595468 has 180 divisors, whose sum is σ = 69558838272. Its totient is φ = 5601597120.

The previous prime is 21239595463. The next prime is 21239595511. The reversal of 21239595468 is 86459593212.

21239595468 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 9 + 595 + 46 + 8 = 666.

It is a super-2 number, since 2×21239595468² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21239595463) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 154933 + ... + 257843.

Almost surely, 2^21239595468 is an apocalyptic number.

21239595468 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21239595468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34779419136).

21239595468 is an abundant number, since it is smaller than the sum of its proper divisors (48319242804).

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

21239595468 is a wasteful number, since it uses less digits than its factorization.

21239595468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102954 (or 102936 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 21239595468 in words is "twenty-one billion, two hundred thirty-nine million, five hundred ninety-five thousand, four hundred sixty-eight".