221555040370126 has 16 divisors (see below), whose sum is σ = 332873937211680. Its totient is φ = 110597076807840.

The previous prime is 221555040370093. The next prime is 221555040370133. The reversal of 221555040370126 is 621073040555122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24793360 + ... + 32524156.

It is an arithmetic number, because the mean of its divisors is an integer number (20804621075730).

Almost surely, 2^{221555040370126} is an apocalyptic number.

221555040370126 is a deficient number, since it is larger than the sum of its proper divisors (111318896841554).

221555040370126 is a wasteful number, since it uses less digits than its factorization.

221555040370126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7754139.

The product of its (nonzero) digits is 504000, while the sum is 43.

The spelling of 221555040370126 in words is "two hundred twenty-one trillion, five hundred fifty-five billion, forty million, three hundred seventy thousand, one hundred twenty-six".