21152123132 has 24 divisors (see below), whose sum is σ = 42461526240. Its totient is φ = 9031492800.

The previous prime is 21152123107. The next prime is 21152123189. The reversal of 21152123132 is 23132125112.

It is a junction number, because it is equal to n+sod(n) for n = 21152123098 and 21152123107.

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 7 ways as a sum of consecutive naturals, for example, 1396619 + ... + 1411682.

It is an arithmetic number, because the mean of its divisors is an integer number (1769230260).

Almost surely, 2^21152123132 is an apocalyptic number.

It is an amenable number.

21152123132 is an abundant number, since it is smaller than the sum of its proper divisors (21309403108).

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

21152123132 is a wasteful number, since it uses less digits than its factorization.

21152123132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808581 (or 2808579 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

Adding to 21152123132 its reverse (23132125112), we get a palindrome (44284248244).

The spelling of 21152123132 in words is "twenty-one billion, one hundred fifty-two million, one hundred twenty-three thousand, one hundred thirty-two".