221751440015550 has 96 divisors (see below), whose sum is σ = 551517817600512. Its totient is φ = 58964622689280.

The previous prime is 221751440015527. The next prime is 221751440015617. The reversal of 221751440015550 is 55510044157122.

It is a happy number.

It is a super-2 number, since 2×221751440015550² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97986382 + ... + 100223918.

It is an arithmetic number, because the mean of its divisors is an integer number (5744977266672).

Almost surely, 2^{221751440015550} is an apocalyptic number.

221751440015550 is an abundant number, since it is smaller than the sum of its proper divisors (329766377584962).

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

221751440015550 is a wasteful number, since it uses less digits than its factorization.

221751440015550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239442 (or 2239437 counting only the distinct ones).

The product of its (nonzero) digits is 280000, while the sum is 42.

The spelling of 221751440015550 in words is "two hundred twenty-one trillion, seven hundred fifty-one billion, four hundred forty million, fifteen thousand, five hundred fifty".