21471481152 has 168 divisors, whose sum is σ = 67949612640. Its totient is φ = 6427960320.

The previous prime is 21471481147. The next prime is 21471481177. The reversal of 21471481152 is 25118417412.

21471481152 is a `hidden beast` number, since 21 + 4 + 7 + 1 + 481 + 152 = 666.

It is a super-2 number, since 2×21471481152² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505474 + ... + 546302.

It is an arithmetic number, because the mean of its divisors is an integer number (404461980).

Almost surely, 2^21471481152 is an apocalyptic number.

21471481152 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 21471481152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33974806320).

21471481152 is an abundant number, since it is smaller than the sum of its proper divisors (46478131488).

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

21471481152 is a wasteful number, since it uses less digits than its factorization.

21471481152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40941 (or 40928 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

Adding to 21471481152 its reverse (25118417412), we get a palindrome (46589898564).

The spelling of 21471481152 in words is "twenty-one billion, four hundred seventy-one million, four hundred eighty-one thousand, one hundred fifty-two".