211231131102001 has 4 divisors (see below), whose sum is σ = 211231387543792. Its totient is φ = 211230874660212.

The previous prime is 211231131101941. The next prime is 211231131102007. The reversal of 211231131102001 is 100201131132112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211231131102001 - 2²⁷ = 211230996884273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211231131102001.

It is not an unprimeable number, because it can be changed into a prime (211231131102007) 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 3 ways as a sum of consecutive naturals, for example, 126981351 + ... + 128634076.

It is an arithmetic number, because the mean of its divisors is an integer number (52807846885948).

Almost surely, 2^{211231131102001} is an apocalyptic number.

It is an amenable number.

211231131102001 is a deficient number, since it is larger than the sum of its proper divisors (256441791).

211231131102001 is an equidigital number, since it uses as much as digits as its factorization.

211231131102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256441790.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 211231131102001 its reverse (100201131132112), we get a palindrome (311432262234113).

The spelling of 211231131102001 in words is "two hundred eleven trillion, two hundred thirty-one billion, one hundred thirty-one million, one hundred two thousand, one".