21230539550 has 24 divisors (see below), whose sum is σ = 43078695912. Its totient is φ = 7720196000.

The previous prime is 21230539549. The next prime is 21230539601. The reversal of 21230539550 is 5593503212.

It is a super-2 number, since 2×21230539550² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21230539550.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19299941 + ... + 19301040.

It is an arithmetic number, because the mean of its divisors is an integer number (1794945663).

Almost surely, 2^21230539550 is an apocalyptic number.

21230539550 is an abundant number, since it is smaller than the sum of its proper divisors (21848156362).

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

21230539550 is a wasteful number, since it uses less digits than its factorization.

21230539550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38601004 (or 38600999 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 35.

The spelling of 21230539550 in words is "twenty-one billion, two hundred thirty million, five hundred thirty-nine thousand, five hundred fifty".