1131222021 has 16 divisors (see below), whose sum is σ = 1550830848. Its totient is φ = 733017600.

The previous prime is 1131222017. The next prime is 1131222049. The reversal of 1131222021 is 1202221311.

It is not a de Polignac number, because 1131222021 - 2² = 1131222017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131222011) 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, 16365 + ... + 50301.

It is an arithmetic number, because the mean of its divisors is an integer number (96926928).

Almost surely, 2^1131222021 is an apocalyptic number.

It is an amenable number.

1131222021 is a deficient number, since it is larger than the sum of its proper divisors (419608827).

1131222021 is a wasteful number, since it uses less digits than its factorization.

1131222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34252.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1131222021 is about 33633.6441825741. The cubic root of 1131222021 is about 1041.9557690512.

Adding to 1131222021 its reverse (1202221311), we get a palindrome (2333443332).

It can be divided in two parts, 11312 and 22021, that added together give a palindrome (33333).

The spelling of 1131222021 in words is "one billion, one hundred thirty-one million, two hundred twenty-two thousand, twenty-one".