211535421064345 has 16 divisors (see below), whose sum is σ = 290966568167808. Its totient is φ = 144622436232960.

The previous prime is 211535421064337. The next prime is 211535421064379. The reversal of 211535421064345 is 543460124535112.

It is a happy number.

It is not a de Polignac number, because 211535421064345 - 2³ = 211535421064337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211535421064295 and 211535421064304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8967153151 + ... + 8967176740.

It is an arithmetic number, because the mean of its divisors is an integer number (18185410510488).

Almost surely, 2^{211535421064345} is an apocalyptic number.

It is an amenable number.

211535421064345 is a deficient number, since it is larger than the sum of its proper divisors (79431147103463).

211535421064345 is a wasteful number, since it uses less digits than its factorization.

211535421064345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17934330240.

The product of its (nonzero) digits is 1728000, while the sum is 46.

Adding to 211535421064345 its reverse (543460124535112), we get a palindrome (754995545599457).

The spelling of 211535421064345 in words is "two hundred eleven trillion, five hundred thirty-five billion, four hundred twenty-one million, sixty-four thousand, three hundred forty-five".