21550060072 has 64 divisors (see below), whose sum is σ = 43762320000. Its totient is φ = 9913902336.

The previous prime is 21550060069. The next prime is 21550060079. The reversal of 21550060072 is 27006005512.

It is a self number, because there is not a number n which added to its sum of digits gives 21550060072.

It is not an unprimeable number, because it can be changed into a prime (21550060079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3365578 + ... + 3371974.

It is an arithmetic number, because the mean of its divisors is an integer number (683786250).

Almost surely, 2^21550060072 is an apocalyptic number.

It is an amenable number.

21550060072 is an abundant number, since it is smaller than the sum of its proper divisors (22212259928).

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

21550060072 is a wasteful number, since it uses less digits than its factorization.

21550060072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058 (or 7054 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

Adding to 21550060072 its reverse (27006005512), we get a palindrome (48556065584).

It can be divided in two parts, 215500 and 60072, that added together give a palindrome (275572).

The spelling of 21550060072 in words is "twenty-one billion, five hundred fifty million, sixty thousand, seventy-two".