221500761772 has 6 divisors (see below), whose sum is σ = 387626333108. Its totient is φ = 110750380884.

The previous prime is 221500761767. The next prime is 221500761817. The reversal of 221500761772 is 277167005122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27687595218 + ... + 27687595225.

Almost surely, 2^221500761772 is an apocalyptic number.

It is an amenable number.

221500761772 is a deficient number, since it is larger than the sum of its proper divisors (166125571336).

221500761772 is a wasteful number, since it uses less digits than its factorization.

221500761772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55375190447 (or 55375190445 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 40.

Adding to 221500761772 its reverse (277167005122), we get a palindrome (498667766894).

The spelling of 221500761772 in words is "two hundred twenty-one billion, five hundred million, seven hundred sixty-one thousand, seven hundred seventy-two".