1211220102001 has 16 divisors (see below), whose sum is σ = 1490867392000. Its totient is φ = 958241233728.

The previous prime is 1211220101941. The next prime is 1211220102031. The reversal of 1211220102001 is 1002010221121.

It is a cyclic number.

It is not a de Polignac number, because 1211220102001 - 2¹⁷ = 1211219970929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (1211220102031) 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, 417640 + ... + 1611478.

It is an arithmetic number, because the mean of its divisors is an integer number (93179212000).

Almost surely, 2^{1211220102001} is an apocalyptic number.

It is an amenable number.

1211220102001 is a deficient number, since it is larger than the sum of its proper divisors (279647289999).

1211220102001 is a wasteful number, since it uses less digits than its factorization.

1211220102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205008.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211220102001 its reverse (1002010221121), we get a palindrome (2213230323122).

The spelling of 1211220102001 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred two thousand, one".