221431354066442 has 24 divisors (see below), whose sum is σ = 359681108794380. Its totient is φ = 102193704912000.

The previous prime is 221431354066381. The next prime is 221431354066453. The reversal of 221431354066442 is 244660453134122.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2328923218561 + 219102430847881 = 1526081^2 + 14802109^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10816817 + ... + 23661492.

Almost surely, 2^{221431354066442} is an apocalyptic number.

221431354066442 is a deficient number, since it is larger than the sum of its proper divisors (138249754727938).

221431354066442 is a wasteful number, since it uses less digits than its factorization.

221431354066442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34497338 (or 34497325 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 47.

The spelling of 221431354066442 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, three hundred fifty-four million, sixty-six thousand, four hundred forty-two".