21527358280 has 32 divisors (see below), whose sum is σ = 48625048440. Its totient is φ = 8577433600.

The previous prime is 21527358257. The next prime is 21527358299. The reversal of 21527358280 is 8285372512.

It can be written as a sum of positive squares in 4 ways, for example, as 21527345284 + 12996 = 146722^2 + 114^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1036771 + ... + 1057330.

Almost surely, 2^21527358280 is an apocalyptic number.

21527358280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21527358280 is an abundant number, since it is smaller than the sum of its proper divisors (27097690160).

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

21527358280 is a wasteful number, since it uses less digits than its factorization.

21527358280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094369 (or 2094365 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 21527358280 in words is "twenty-one billion, five hundred twenty-seven million, three hundred fifty-eight thousand, two hundred eighty".