221421255544742 has 128 divisors (see below), whose sum is σ = 399869002045440. Its totient is φ = 90799538319360.

The previous prime is 221421255544717. The next prime is 221421255544787. The reversal of 221421255544742 is 247445552124122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 499371713 + ... + 499814915.

It is an arithmetic number, because the mean of its divisors is an integer number (3123976578480).

Almost surely, 2^{221421255544742} is an apocalyptic number.

221421255544742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221421255544742 is a deficient number, since it is larger than the sum of its proper divisors (178447746500698).

221421255544742 is a wasteful number, since it uses less digits than its factorization.

221421255544742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443806.

The product of its digits is 7168000, while the sum is 50.

The spelling of 221421255544742 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred forty-two".