211355315421601 has 4 divisors (see below), whose sum is σ = 227613416607892. Its totient is φ = 195097214235312.

The previous prime is 211355315421557. The next prime is 211355315421611. The reversal of 211355315421601 is 106124513553112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63451165709376 + 147904149712225 = 7965624^2 + 12161585^2 .

It is a cyclic number.

It is not a de Polignac number, because 211355315421601 - 2⁷ = 211355315421473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211355315421611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8129050593126 + ... + 8129050593151.

It is an arithmetic number, because the mean of its divisors is an integer number (56903354151973).

Almost surely, 2^{211355315421601} is an apocalyptic number.

It is an amenable number.

211355315421601 is a deficient number, since it is larger than the sum of its proper divisors (16258101186291).

211355315421601 is a wasteful number, since it uses less digits than its factorization.

211355315421601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16258101186290.

The product of its (nonzero) digits is 108000, while the sum is 40.

Adding to 211355315421601 its reverse (106124513553112), we get a palindrome (317479828974713).

The spelling of 211355315421601 in words is "two hundred eleven trillion, three hundred fifty-five billion, three hundred fifteen million, four hundred twenty-one thousand, six hundred one".