1211011321001 has 16 divisors (see below), whose sum is σ = 1263712709760. Its totient is φ = 1159082265600.

The previous prime is 1211011320997. The next prime is 1211011321019. The reversal of 1211011321001 is 1001231101121.

It is a cyclic number.

It is not a de Polignac number, because 1211011321001 - 2² = 1211011320997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211011321901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1201676 + ... + 1966226.

It is an arithmetic number, because the mean of its divisors is an integer number (78982044360).

Almost surely, 2^{1211011321001} is an apocalyptic number.

It is an amenable number.

1211011321001 is a deficient number, since it is larger than the sum of its proper divisors (52701388759).

1211011321001 is a wasteful number, since it uses less digits than its factorization.

1211011321001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765056.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1211011321001 its reverse (1001231101121), we get a palindrome (2212242422122).

The spelling of 1211011321001 in words is "one trillion, two hundred eleven billion, eleven million, three hundred twenty-one thousand, one".