21647322312 has 384 divisors, whose sum is σ = 70739827200. Its totient is φ = 5456640000.

The previous prime is 21647322211. The next prime is 21647322313. The reversal of 21647322312 is 21322374612.

It is a super-2 number, since 2×21647322312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21647322313) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 86244187 + ... + 86244437.

It is an arithmetic number, because the mean of its divisors is an integer number (184218300).

Almost surely, 2^21647322312 is an apocalyptic number.

21647322312 is a gapful number since it is divisible by the number (22) 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 21647322312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35369913600).

21647322312 is an abundant number, since it is smaller than the sum of its proper divisors (49092504888).

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

21647322312 is a wasteful number, since it uses less digits than its factorization.

21647322312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 446 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

Adding to 21647322312 its reverse (21322374612), we get a palindrome (42969696924).

The spelling of 21647322312 in words is "twenty-one billion, six hundred forty-seven million, three hundred twenty-two thousand, three hundred twelve".