221534403655172 has 12 divisors (see below), whose sum is σ = 387696925190736. Its totient is φ = 110763853600680.

The previous prime is 221534403655153. The next prime is 221534403655183. The reversal of 221534403655172 is 271556304435122.

It is a self number, because there is not a number n which added to its sum of digits gives 221534403655172.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836907854 + ... + 837172517.

It is an arithmetic number, because the mean of its divisors is an integer number (32308077099228).

Almost surely, 2^{221534403655172} is an apocalyptic number.

It is an amenable number.

221534403655172 is a deficient number, since it is larger than the sum of its proper divisors (166162521535564).

221534403655172 is a wasteful number, since it uses less digits than its factorization.

221534403655172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674113458 (or 1674113456 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 50.

The spelling of 221534403655172 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred three million, six hundred fifty-five thousand, one hundred seventy-two".