21153250452 has 48 divisors (see below), whose sum is σ = 50384158272. Its totient is φ = 6905648640.

The previous prime is 21153250409. The next prime is 21153250507. The reversal of 21153250452 is 25405235112.

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 15 ways as a sum of consecutive naturals, for example, 63052 + ... + 215132.

It is an arithmetic number, because the mean of its divisors is an integer number (1049669964).

Almost surely, 2^21153250452 is an apocalyptic number.

It is an amenable number.

21153250452 is an abundant number, since it is smaller than the sum of its proper divisors (29230907820).

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

21153250452 is a wasteful number, since it uses less digits than its factorization.

21153250452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152328 (or 152326 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21153250452 its reverse (25405235112), we get a palindrome (46558485564).

The spelling of 21153250452 in words is "twenty-one billion, one hundred fifty-three million, two hundred fifty thousand, four hundred fifty-two".