1012112220221 has 4 divisors (see below), whose sum is σ = 1012118851200. Its totient is φ = 1012105589244.

The previous prime is 1012112220209. The next prime is 1012112220257. The reversal of 1012112220221 is 1220222112101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012112220221 is a prime.

It is a super-4 number, since 4×1012112220221⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012112220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012112220121) 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, 3081011 + ... + 3393648.

It is an arithmetic number, because the mean of its divisors is an integer number (253029712800).

Almost surely, 2^{1012112220221} is an apocalyptic number.

It is an amenable number.

1012112220221 is a deficient number, since it is larger than the sum of its proper divisors (6630979).

1012112220221 is an equidigital number, since it uses as much as digits as its factorization.

1012112220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630978.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1012112220221 its reverse (1220222112101), we get a palindrome (2232334332322).

The spelling of 1012112220221 in words is "one trillion, twelve billion, one hundred twelve million, two hundred twenty thousand, two hundred twenty-one".