221890518550 has 24 divisors (see below), whose sum is σ = 430660556496. Its totient is φ = 84897241440.

The previous prime is 221890518529. The next prime is 221890518559. The reversal of 221890518550 is 55815098122.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 221890518550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221890518559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96472989 + ... + 96475288.

It is an arithmetic number, because the mean of its divisors is an integer number (17944189854).

Almost surely, 2^221890518550 is an apocalyptic number.

221890518550 is a deficient number, since it is larger than the sum of its proper divisors (208770037946).

221890518550 is a wasteful number, since it uses less digits than its factorization.

221890518550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192948312 (or 192948307 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 46.

The spelling of 221890518550 in words is "two hundred twenty-one billion, eight hundred ninety million, five hundred eighteen thousand, five hundred fifty".