11212400421 has 12 divisors (see below), whose sum is σ = 16590706860. Its totient is φ = 7292617920.

The previous prime is 11212400411. The next prime is 11212400449. The reversal of 11212400421 is 12400421211.

11212400421 is a `hidden beast` number, since 1 + 1 + 2 + 1 + 240 + 0 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4440756321 + 6771644100 = 66639^2 + 82290^2 .

It is not a de Polignac number, because 11212400421 - 2¹⁰ = 11212399397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212400394 and 11212400403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212400411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15192586 + ... + 15193323.

It is an arithmetic number, because the mean of its divisors is an integer number (1382558905).

Almost surely, 2^11212400421 is an apocalyptic number.

It is an amenable number.

11212400421 is a deficient number, since it is larger than the sum of its proper divisors (5378306439).

11212400421 is a wasteful number, since it uses less digits than its factorization.

11212400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30385956 (or 30385953 counting only the distinct ones).

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

Adding to 11212400421 its reverse (12400421211), we get a palindrome (23612821632).

The spelling of 11212400421 in words is "eleven billion, two hundred twelve million, four hundred thousand, four hundred twenty-one".