11212040421 has 6 divisors (see below), whose sum is σ = 16195169510. Its totient is φ = 7474693608.

The previous prime is 11212040419. The next prime is 11212040459. The reversal of 11212040421 is 12404021211.

It can be written as a sum of positive squares in only one way, i.e., 10505225025 + 706815396 = 102495^2 + 26586^2 .

It is not a de Polignac number, because 11212040421 - 2¹ = 11212040419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11212040394 and 11212040403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212040471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622891126 + ... + 622891143.

Almost surely, 2^11212040421 is an apocalyptic number.

It is an amenable number.

11212040421 is a deficient number, since it is larger than the sum of its proper divisors (4983129089).

11212040421 is a wasteful number, since it uses less digits than its factorization.

11212040421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245782275 (or 1245782272 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 11212040421 its reverse (12404021211), we get a palindrome (23616061632).

The spelling of 11212040421 in words is "eleven billion, two hundred twelve million, forty thousand, four hundred twenty-one".