221995514897 has 8 divisors (see below), whose sum is σ = 245533501416. Its totient is φ = 199380586752.

The previous prime is 221995514843. The next prime is 221995514929. The reversal of 221995514897 is 798415599122.

It is a Cunningham number, because it is equal to 471164²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 32839238656 + 189156276241 = 181216^2 + 434921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221995514897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221995514597) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 230764088 + ... + 230765049.

It is an arithmetic number, because the mean of its divisors is an integer number (30691687677).

Almost surely, 2^221995514897 is an apocalyptic number.

It is an amenable number.

221995514897 is a deficient number, since it is larger than the sum of its proper divisors (23537986519).

221995514897 is a wasteful number, since it uses less digits than its factorization.

221995514897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461529187.

The product of its digits is 16329600, while the sum is 62.

The spelling of 221995514897 in words is "two hundred twenty-one billion, nine hundred ninety-five million, five hundred fourteen thousand, eight hundred ninety-seven".