1021201210111 has 4 divisors (see below), whose sum is σ = 1022995940400. Its totient is φ = 1019406479824.

The previous prime is 1021201210103. The next prime is 1021201210121. The reversal of 1021201210111 is 1110121021201.

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 1021201210111 - 2³ = 1021201210103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021201210091 and 1021201210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021201210121) 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, 897364291 + ... + 897365428.

It is an arithmetic number, because the mean of its divisors is an integer number (255748985100).

Almost surely, 2^{1021201210111} is an apocalyptic number.

1021201210111 is a deficient number, since it is larger than the sum of its proper divisors (1794730289).

1021201210111 is an equidigital number, since it uses as much as digits as its factorization.

1021201210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794730288.

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

Adding to 1021201210111 its reverse (1110121021201), we get a palindrome (2131322231312).

The spelling of 1021201210111 in words is "one trillion, twenty-one billion, two hundred one million, two hundred ten thousand, one hundred eleven".