1201111021001 has 4 divisors (see below), whose sum is σ = 1202933648400. Its totient is φ = 1199288393604.

The previous prime is 1201111020997. The next prime is 1201111021003. The reversal of 1201111021001 is 1001201111021.

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 1201111021001 - 2² = 1201111020997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201111021003) 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, 911312711 + ... + 911314028.

It is an arithmetic number, because the mean of its divisors is an integer number (300733412100).

Almost surely, 2^{1201111021001} is an apocalyptic number.

It is an amenable number.

1201111021001 is a deficient number, since it is larger than the sum of its proper divisors (1822627399).

1201111021001 is an equidigital number, since it uses as much as digits as its factorization.

1201111021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822627398.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1201111021001 its reverse (1001201111021), we get a palindrome (2202312132022).

The spelling of 1201111021001 in words is "one trillion, two hundred one billion, one hundred eleven million, twenty-one thousand, one".