1012200111221 has 64 divisors (see below), whose sum is σ = 1205702184960. Its totient is φ = 840835399680.

The previous prime is 1012200111217. The next prime is 1012200111233. The reversal of 1012200111221 is 1221110022101.

It is a cyclic number.

It is not a de Polignac number, because 1012200111221 - 2² = 1012200111217 is a prime.

It is a super-2 number, since 2×1012200111221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1012200111196 and 1012200111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012200111281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 649261640 + ... + 649263198.

It is an arithmetic number, because the mean of its divisors is an integer number (18839096640).

Almost surely, 2^{1012200111221} is an apocalyptic number.

It is an amenable number.

1012200111221 is a deficient number, since it is larger than the sum of its proper divisors (193502073739).

1012200111221 is a wasteful number, since it uses less digits than its factorization.

1012200111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2694.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1012200111221 its reverse (1221110022101), we get a palindrome (2233310133322).

The spelling of 1012200111221 in words is "one trillion, twelve billion, two hundred million, one hundred eleven thousand, two hundred twenty-one".