21562135060 has 24 divisors (see below), whose sum is σ = 45283250376. Its totient is φ = 8624327040.

The previous prime is 21562135019. The next prime is 21562135069. The reversal of 21562135060 is 6053126512.

It can be written as a sum of positive squares in 4 ways, for example, as 457018884 + 21105116176 = 21378^2 + 145276^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21562135069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589054 + ... + 624586.

It is an arithmetic number, because the mean of its divisors is an integer number (1886802099).

Almost surely, 2^21562135060 is an apocalyptic number.

21562135060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21562135060 is an abundant number, since it is smaller than the sum of its proper divisors (23721115316).

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

21562135060 is a wasteful number, since it uses less digits than its factorization.

21562135060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65883 (or 65881 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21562135060 in words is "twenty-one billion, five hundred sixty-two million, one hundred thirty-five thousand, sixty".