1000021122109 has 4 divisors (see below), whose sum is σ = 1000054618780. Its totient is φ = 999987625440.

The previous prime is 1000021122073. The next prime is 1000021122119. The reversal of 1000021122109 is 9012211200001.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 595783296900 + 404237825209 = 771870^2 + 635797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000021122109 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 (1000021122119) 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, 16703514 + ... + 16763275.

It is an arithmetic number, because the mean of its divisors is an integer number (250013654695).

Almost surely, 2^{1000021122109} is an apocalyptic number.

It is an amenable number.

1000021122109 is a deficient number, since it is larger than the sum of its proper divisors (33496671).

1000021122109 is an equidigital number, since it uses as much as digits as its factorization.

1000021122109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33496670.

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

The spelling of 1000021122109 in words is "one trillion, twenty-one million, one hundred twenty-two thousand, one hundred nine".