211665420001 has 24 divisors (see below), whose sum is σ = 247474993920. Its totient is φ = 180506001312.

The previous prime is 211665419971. The next prime is 211665420013. The reversal of 211665420001 is 100024566112.

It is not a de Polignac number, because 211665420001 - 2⁷ = 211665419873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211665420601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22166110 + ... + 22175656.

It is an arithmetic number, because the mean of its divisors is an integer number (10311458080).

Almost surely, 2^211665420001 is an apocalyptic number.

It is an amenable number.

211665420001 is a deficient number, since it is larger than the sum of its proper divisors (35809573919).

211665420001 is a wasteful number, since it uses less digits than its factorization.

211665420001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11813 (or 11806 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 211665420001 its reverse (100024566112), we get a palindrome (311689986113).

The spelling of 211665420001 in words is "two hundred eleven billion, six hundred sixty-five million, four hundred twenty thousand, one".