1000021122091 has 4 divisors (see below), whose sum is σ = 1000176870784. Its totient is φ = 999865373400.

The previous prime is 1000021122073. The next prime is 1000021122119. The reversal of 1000021122091 is 1902211200001.

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 1000021122091 - 2⁷ = 1000021121963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000021129091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77864715 + ... + 77877556.

It is an arithmetic number, because the mean of its divisors is an integer number (250044217696).

Almost surely, 2^{1000021122091} is an apocalyptic number.

1000021122091 is a deficient number, since it is larger than the sum of its proper divisors (155748693).

1000021122091 is an equidigital number, since it uses as much as digits as its factorization.

1000021122091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155748692.

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

Adding to 1000021122091 its reverse (1902211200001), we get a palindrome (2902232322092).

The spelling of 1000021122091 in words is "one trillion, twenty-one million, one hundred twenty-two thousand, ninety-one".