21575427048 has 384 divisors, whose sum is σ = 72648576000. Its totient is φ = 5647242240.

The previous prime is 21575427017. The next prime is 21575427059. The reversal of 21575427048 is 84072457512.

21575427048 is a `hidden beast` number, since 2 + 1 + 575 + 4 + 2 + 70 + 4 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21575426994 and 21575427012.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70278111 + ... + 70278417.

It is an arithmetic number, because the mean of its divisors is an integer number (189189000).

Almost surely, 2^21575427048 is an apocalyptic number.

21575427048 is a gapful number since it is divisible by the number (28) 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 21575427048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36324288000).

21575427048 is an abundant number, since it is smaller than the sum of its proper divisors (51073148952).

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

21575427048 is a wasteful number, since it uses less digits than its factorization.

21575427048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 45.

The spelling of 21575427048 in words is "twenty-one billion, five hundred seventy-five million, four hundred twenty-seven thousand, forty-eight".