221665142420001 has 24 divisors (see below), whose sum is σ = 365938161912960. Its totient is φ = 126660689136576.

The previous prime is 221665142419969. The next prime is 221665142420023. The reversal of 221665142420001 is 100024241566122.

221665142420001 is a `hidden beast` number, since 2 + 2 + 166 + 51 + 424 + 20 + 0 + 0 + 1 = 666.

It is not a de Polignac number, because 221665142420001 - 2⁵ = 221665142419969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221665142420101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69348685 + ... + 72474618.

It is an arithmetic number, because the mean of its divisors is an integer number (15247423413040).

Almost surely, 2^{221665142420001} is an apocalyptic number.

221665142420001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221665142420001 is a deficient number, since it is larger than the sum of its proper divisors (144273019492959).

221665142420001 is a wasteful number, since it uses less digits than its factorization.

221665142420001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141848125 (or 141848122 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 221665142420001 its reverse (100024241566122), we get a palindrome (321689383986123).

The spelling of 221665142420001 in words is "two hundred twenty-one trillion, six hundred sixty-five billion, one hundred forty-two million, four hundred twenty thousand, one".