1210000111001 has 4 divisors (see below), whose sum is σ = 1320000121104. Its totient is φ = 1100000100900.

The previous prime is 1210000110997. The next prime is 1210000111003. The reversal of 1210000111001 is 1001110000121.

It is a happy number.

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 1210000111001 - 2² = 1210000110997 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 1210000111001.

It is not an unprimeable number, because it can be changed into a prime (1210000111003) 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, 55000005035 + ... + 55000005056.

It is an arithmetic number, because the mean of its divisors is an integer number (330000030276).

Almost surely, 2^{1210000111001} is an apocalyptic number.

1210000111001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210000111001 is a deficient number, since it is larger than the sum of its proper divisors (110000010103).

1210000111001 is a wasteful number, since it uses less digits than its factorization.

1210000111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110000010102.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 1210000111001 its reverse (1001110000121), we get a palindrome (2211110111122).

The spelling of 1210000111001 in words is "one trillion, two hundred ten billion, one hundred eleven thousand, one".