21365547060 has 96 divisors (see below), whose sum is σ = 70282219392. Its totient is φ = 4781099520.

The previous prime is 21365547053. The next prime is 21365547061. The reversal of 21365547060 is 6074556312.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365547061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1236499 + ... + 1253658.

It is an arithmetic number, because the mean of its divisors is an integer number (732106452).

Almost surely, 2^21365547060 is an apocalyptic number.

21365547060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21365547060 is an abundant number, since it is smaller than the sum of its proper divisors (48916672332).

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

21365547060 is a wasteful number, since it uses less digits than its factorization.

21365547060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490193 (or 2490191 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21365547060 in words is "twenty-one billion, three hundred sixty-five million, five hundred forty-seven thousand, sixty".