21465332460 has 288 divisors, whose sum is σ = 80522507520. Its totient is φ = 4550515200.

The previous prime is 21465332459. The next prime is 21465332461. The reversal of 21465332460 is 6423356412.

21465332460 is a `hidden beast` number, since 2 + 1 + 46 + 533 + 24 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (21465332459) and next prime (21465332461).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21465332461) 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, 467115 + ... + 511005.

It is an arithmetic number, because the mean of its divisors is an integer number (279592040).

Almost surely, 2^21465332460 is an apocalyptic number.

21465332460 is a gapful number since it is divisible by the number (20) 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 21465332460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40261253760).

21465332460 is an abundant number, since it is smaller than the sum of its proper divisors (59057175060).

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

21465332460 is a wasteful number, since it uses less digits than its factorization.

21465332460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43949 (or 43944 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 21465332460 its reverse (6423356412), we get a palindrome (27888688872).

The spelling of 21465332460 in words is "twenty-one billion, four hundred sixty-five million, three hundred thirty-two thousand, four hundred sixty".