1021200120111 has 8 divisors (see below), whose sum is σ = 1365895430064. Its totient is φ = 678652445120.

The previous prime is 1021200120089. The next prime is 1021200120173. The reversal of 1021200120111 is 1110210021201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021200120111 - 2¹⁰ = 1021200119087 is a prime.

It is a super-3 number, since 3×1021200120111³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021200125111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536907630 + ... + 536909531.

It is an arithmetic number, because the mean of its divisors is an integer number (170736928758).

Almost surely, 2^{1021200120111} is an apocalyptic number.

1021200120111 is a deficient number, since it is larger than the sum of its proper divisors (344695309953).

1021200120111 is a wasteful number, since it uses less digits than its factorization.

1021200120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073817481.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021200120111 its reverse (1110210021201), we get a palindrome (2131410141312).

The spelling of 1021200120111 in words is "one trillion, twenty-one billion, two hundred million, one hundred twenty thousand, one hundred eleven".