1012112221 has 16 divisors (see below), whose sum is σ = 1094192064. Its totient is φ = 932615424.

The previous prime is 1012112203. The next prime is 1012112239. The reversal of 1012112221 is 1222112101.

It is an interprime number because it is at equal distance from previous prime (1012112203) and next prime (1012112239).

It is a cyclic number.

It is not a de Polignac number, because 1012112221 - 2²³ = 1003723613 is a prime.

It is a super-2 number, since 2×1012112221² = 2048742295795105682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012112261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578470 + ... + 580216.

It is an arithmetic number, because the mean of its divisors is an integer number (68387004).

Almost surely, 2^1012112221 is an apocalyptic number.

It is an amenable number.

1012112221 is a deficient number, since it is larger than the sum of its proper divisors (82079843).

1012112221 is a wasteful number, since it uses less digits than its factorization.

1012112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1012112221 is about 31813.7112107343. The cubic root of 1012112221 is about 1004.0212151541.

Adding to 1012112221 its reverse (1222112101), we get a palindrome (2234224322).

The spelling of 1012112221 in words is "one billion, twelve million, one hundred twelve thousand, two hundred twenty-one".