1201021210111 has 16 divisors (see below), whose sum is σ = 1245575752960. Its totient is φ = 1156838941440.

The previous prime is 1201021210093. The next prime is 1201021210153. The reversal of 1201021210111 is 1110121201021.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1201021210111 - 2⁵ = 1201021210079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201021210091 and 1201021210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201021210511) 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, 7971385 + ... + 8120653.

It is an arithmetic number, because the mean of its divisors is an integer number (77848484560).

Almost surely, 2^{1201021210111} is an apocalyptic number.

1201021210111 is a deficient number, since it is larger than the sum of its proper divisors (44554542849).

1201021210111 is a wasteful number, since it uses less digits than its factorization.

1201021210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150514.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1201021210111 its reverse (1110121201021), we get a palindrome (2311142411132).

The spelling of 1201021210111 in words is "one trillion, two hundred one billion, twenty-one million, two hundred ten thousand, one hundred eleven".