21254502528 has 96 divisors (see below), whose sum is σ = 69899506560. Its totient is φ = 6072712704.

The previous prime is 21254502473. The next prime is 21254502557. The reversal of 21254502528 is 82520545212.

21254502528 is a `hidden beast` number, since 2 + 125 + 4 + 5 + 0 + 2 + 528 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a junction number, because it is equal to n+sod(n) for n = 21254502492 and 21254502501.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1309800 + ... + 1325927.

It is an arithmetic number, because the mean of its divisors is an integer number (728119860).

Almost surely, 2^21254502528 is an apocalyptic number.

21254502528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21254502528 is an abundant number, since it is smaller than the sum of its proper divisors (48645004032).

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

21254502528 is a wasteful number, since it uses less digits than its factorization.

21254502528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635754 (or 2635739 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The spelling of 21254502528 in words is "twenty-one billion, two hundred fifty-four million, five hundred two thousand, five hundred twenty-eight".