1021122091 has 8 divisors (see below), whose sum is σ = 1117320768. Its totient is φ = 925485000.

The previous prime is 1021122077. The next prime is 1021122101. The reversal of 1021122091 is 1902211201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021122091 - 2⁵ = 1021122059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021122031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136585 + ... + 143866.

It is an arithmetic number, because the mean of its divisors is an integer number (139665096).

Almost surely, 2^1021122091 is an apocalyptic number.

1021122091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1021122091 is a deficient number, since it is larger than the sum of its proper divisors (96198677).

1021122091 is a wasteful number, since it uses less digits than its factorization.

1021122091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280793.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1021122091 is about 31955.0010327022. The cubic root of 1021122091 is about 1006.9916992150.

Adding to 1021122091 its reverse (1902211201), we get a palindrome (2923333292).

The spelling of 1021122091 in words is "one billion, twenty-one million, one hundred twenty-two thousand, ninety-one".