11400212421 has 24 divisors (see below), whose sum is σ = 17737257720. Its totient is φ = 7014093696.

The previous prime is 11400212377. The next prime is 11400212437. The reversal of 11400212421 is 12421200411.

11400212421 is a `hidden beast` number, since 1 + 1 + 400 + 21 + 242 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 296321796 + 11103890625 = 17214^2 + 105375^2 .

It is not a de Polignac number, because 11400212421 - 2⁶ = 11400212357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11400212394 and 11400212403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11400212471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1127175 + ... + 1137243.

It is an arithmetic number, because the mean of its divisors is an integer number (739052405).

Almost surely, 2^11400212421 is an apocalyptic number.

It is an amenable number.

11400212421 is a deficient number, since it is larger than the sum of its proper divisors (6337045299).

11400212421 is a wasteful number, since it uses less digits than its factorization.

11400212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19765 (or 19762 counting only the distinct ones).

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

Adding to 11400212421 its reverse (12421200411), we get a palindrome (23821412832).

The spelling of 11400212421 in words is "eleven billion, four hundred million, two hundred twelve thousand, four hundred twenty-one".