21215810060 has 24 divisors (see below), whose sum is σ = 44573088336. Its totient is φ = 8482536000.

The previous prime is 21215810023. The next prime is 21215810069. The reversal of 21215810060 is 6001851212.

It is a super-2 number, since 2×21215810060² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21215810069) 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, 190607 + ... + 280646.

It is an arithmetic number, because the mean of its divisors is an integer number (1857212014).

Almost surely, 2^21215810060 is an apocalyptic number.

21215810060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21215810060 is an abundant number, since it is smaller than the sum of its proper divisors (23357278276).

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

21215810060 is a wasteful number, since it uses less digits than its factorization.

21215810060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473513 (or 473511 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The spelling of 21215810060 in words is "twenty-one billion, two hundred fifteen million, eight hundred ten thousand, sixty".