1121021102009 has 4 divisors (see below), whose sum is σ = 1121025145716. Its totient is φ = 1121017058304.

The previous prime is 1121021101987. The next prime is 1121021102029. The reversal of 1121021102009 is 9002011201211.

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 273649303225 + 847371798784 = 523115^2 + 920528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121021102009 is a prime.

It is a super-2 number, since 2×1121021102009² (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 (1121021102029) 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, 1572764 + ... + 2171549.

It is an arithmetic number, because the mean of its divisors is an integer number (280256286429).

Almost surely, 2^{1121021102009} is an apocalyptic number.

It is an amenable number.

1121021102009 is a deficient number, since it is larger than the sum of its proper divisors (4043707).

1121021102009 is an equidigital number, since it uses as much as digits as its factorization.

1121021102009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043706.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1121021102009 in words is "one trillion, one hundred twenty-one billion, twenty-one million, one hundred two thousand, nine".