21124151532 has 144 divisors (see below), whose sum is σ = 58793140224. Its totient is φ = 6342048000.

The previous prime is 21124151527. The next prime is 21124151597. The reversal of 21124151532 is 23515142112.

It is a happy number.

21124151532 is a `hidden beast` number, since 2 + 1 + 124 + 1 + 5 + 1 + 532 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21124151496 and 21124151505.

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 47 ways as a sum of consecutive naturals, for example, 27758032 + ... + 27758792.

It is an arithmetic number, because the mean of its divisors is an integer number (408285696).

Almost surely, 2^21124151532 is an apocalyptic number.

21124151532 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 21124151532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29396570112).

21124151532 is an abundant number, since it is smaller than the sum of its proper divisors (37668988692).

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

21124151532 is a wasteful number, since it uses less digits than its factorization.

21124151532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1335 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 21124151532 its reverse (23515142112), we get a palindrome (44639293644).

The spelling of 21124151532 in words is "twenty-one billion, one hundred twenty-four million, one hundred fifty-one thousand, five hundred thirty-two".