1231020100211 has 4 divisors (see below), whose sum is σ = 1342931018424. Its totient is φ = 1119109182000.

The previous prime is 1231020100187. The next prime is 1231020100223. The reversal of 1231020100211 is 1120010201321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231020100211 - 2⁶ = 1231020100147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231020100231) 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, 55955459090 + ... + 55955459111.

It is an arithmetic number, because the mean of its divisors is an integer number (335732754606).

Almost surely, 2^{1231020100211} is an apocalyptic number.

1231020100211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231020100211 is a deficient number, since it is larger than the sum of its proper divisors (111910918213).

1231020100211 is a wasteful number, since it uses less digits than its factorization.

1231020100211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111910918212.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1231020100211 its reverse (1120010201321), we get a palindrome (2351030301532).

The spelling of 1231020100211 in words is "one trillion, two hundred thirty-one billion, twenty million, one hundred thousand, two hundred eleven".