1201021021111 has 4 divisors (see below), whose sum is σ = 1201053484000. Its totient is φ = 1200988558224.

The previous prime is 1201021021063. The next prime is 1201021021121. The reversal of 1201021021111 is 1111201201021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1201021021111 - 2⁹ = 1201021020599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201021021091 and 1201021021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201021021121) 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, 16175886 + ... + 16249963.

It is an arithmetic number, because the mean of its divisors is an integer number (300263371000).

Almost surely, 2^{1201021021111} is an apocalyptic number.

1201021021111 is a deficient number, since it is larger than the sum of its proper divisors (32462889).

1201021021111 is an equidigital number, since it uses as much as digits as its factorization.

1201021021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32462888.

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

Adding to 1201021021111 its reverse (1111201201021), we get a palindrome (2312222222132).

The spelling of 1201021021111 in words is "one trillion, two hundred one billion, twenty-one million, twenty-one thousand, one hundred eleven".