21525051040 has 48 divisors (see below), whose sum is σ = 50967893088. Its totient is φ = 8590556416.

The previous prime is 21525051019. The next prime is 21525051047. The reversal of 21525051040 is 4015052512.

It is a junction number, because it is equal to n+sod(n) for n = 21525050996 and 21525051014.

It is not an unprimeable number, because it can be changed into a prime (21525051047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80962 + ... + 222721.

It is an arithmetic number, because the mean of its divisors is an integer number (1061831106).

Almost surely, 2^21525051040 is an apocalyptic number.

21525051040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21525051040 is an abundant number, since it is smaller than the sum of its proper divisors (29442842048).

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

21525051040 is a wasteful number, since it uses less digits than its factorization.

21525051040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304141 (or 304133 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 21525051040 in words is "twenty-one billion, five hundred twenty-five million, fifty-one thousand, forty".