11122940821 has 4 divisors (see below), whose sum is σ = 11237610412. Its totient is φ = 11008271232.

The previous prime is 11122940819. The next prime is 11122940831. The reversal of 11122940821 is 12804922111.

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 4142338321 + 6980602500 = 64361^2 + 83550^2 .

It is a cyclic number.

It is not a de Polignac number, because 11122940821 - 2¹ = 11122940819 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 (11122940831) 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, 57334650 + ... + 57334843.

It is an arithmetic number, because the mean of its divisors is an integer number (2809402603).

Almost surely, 2^11122940821 is an apocalyptic number.

It is an amenable number.

11122940821 is a deficient number, since it is larger than the sum of its proper divisors (114669591).

11122940821 is an equidigital number, since it uses as much as digits as its factorization.

11122940821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114669590.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 11122940821 in words is "eleven billion, one hundred twenty-two million, nine hundred forty thousand, eight hundred twenty-one".