11204140021 has 2 divisors, whose sum is σ = 11204140022. Its totient is φ = 11204140020.

The previous prime is 11204140009. The next prime is 11204140049. The reversal of 11204140021 is 12004140211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7119140625 + 4084999396 = 84375^2 + 63914^2 .

It is a cyclic number.

It is not a de Polignac number, because 11204140021 - 2⁷ = 11204139893 is a prime.

It is a super-2 number, since 2×11204140021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11204139977 and 11204140004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11204140091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5602070010 + 5602070011.

It is an arithmetic number, because the mean of its divisors is an integer number (5602070011).

Almost surely, 2^11204140021 is an apocalyptic number.

It is an amenable number.

11204140021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11204140021 is an equidigital number, since it uses as much as digits as its factorization.

11204140021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11204140021 its reverse (12004140211), we get a palindrome (23208280232).

The spelling of 11204140021 in words is "eleven billion, two hundred four million, one hundred forty thousand, twenty-one".