1000122021091 has 4 divisors (see below), whose sum is σ = 1058952728232. Its totient is φ = 941291313952.

The previous prime is 1000122021053. The next prime is 1000122021097. The reversal of 1000122021091 is 1901202210001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1000122021091 - 2¹⁵ = 1000121988323 is a prime.

It is a super-2 number, since 2×1000122021091² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000122021097) 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, 29415353545 + ... + 29415353578.

It is an arithmetic number, because the mean of its divisors is an integer number (264738182058).

Almost surely, 2^{1000122021091} is an apocalyptic number.

1000122021091 is a deficient number, since it is larger than the sum of its proper divisors (58830707141).

1000122021091 is an equidigital number, since it uses as much as digits as its factorization.

1000122021091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58830707140.

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

Adding to 1000122021091 its reverse (1901202210001), we get a palindrome (2901324231092).

The spelling of 1000122021091 in words is "one trillion, one hundred twenty-two million, twenty-one thousand, ninety-one".