21424051152 has 160 divisors (see below), whose sum is σ = 70925817600. Its totient is φ = 6064906752.

The previous prime is 21424051147. The next prime is 21424051157. The reversal of 21424051152 is 25115042412.

It is a happy number.

21424051152 is a `hidden beast` number, since 2 + 142 + 4 + 0 + 511 + 5 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21424051147) and next prime (21424051157).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424051157) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 297118 + ... + 362114.

It is an arithmetic number, because the mean of its divisors is an integer number (443286360).

Almost surely, 2^21424051152 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 21424051152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35462908800).

21424051152 is an abundant number, since it is smaller than the sum of its proper divisors (49501766448).

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

21424051152 is a wasteful number, since it uses less digits than its factorization.

21424051152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65130 (or 65118 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21424051152 its reverse (25115042412), we get a palindrome (46539093564).

The spelling of 21424051152 in words is "twenty-one billion, four hundred twenty-four million, fifty-one thousand, one hundred fifty-two".