1012221191 has 16 divisors (see below), whose sum is σ = 1156939200. Its totient is φ = 879825408.

The previous prime is 1012221151. The next prime is 1012221211. The reversal of 1012221191 is 1911222101.

It is a cyclic number.

It is not a de Polignac number, because 1012221191 - 2⁶ = 1012221127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012221121) 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, 33296 + ... + 55973.

It is an arithmetic number, because the mean of its divisors is an integer number (72308700).

Almost surely, 2^1012221191 is an apocalyptic number.

1012221191 is a deficient number, since it is larger than the sum of its proper divisors (144718009).

1012221191 is a wasteful number, since it uses less digits than its factorization.

1012221191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89338.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1012221191 is about 31815.4237909854. The cubic root of 1012221191 is about 1004.0572468191.

Adding to 1012221191 its reverse (1911222101), we get a palindrome (2923443292).

It can be divided in two parts, 10122 and 21191, that added together give a palindrome (31313).

The spelling of 1012221191 in words is "one billion, twelve million, two hundred twenty-one thousand, one hundred ninety-one".