21022526540 has 12 divisors (see below), whose sum is σ = 44147305776. Its totient is φ = 8409010608.

The previous prime is 21022526513. The next prime is 21022526557. The reversal of 21022526540 is 4562522012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525563144 + ... + 525563183.

It is an arithmetic number, because the mean of its divisors is an integer number (3678942148).

Almost surely, 2^21022526540 is an apocalyptic number.

21022526540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022526540 is an abundant number, since it is smaller than the sum of its proper divisors (23124779236).

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

21022526540 is a wasteful number, since it uses less digits than its factorization.

21022526540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051126336 (or 1051126334 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21022526540 in words is "twenty-one billion, twenty-two million, five hundred twenty-six thousand, five hundred forty".