11401212421 has 2 divisors, whose sum is σ = 11401212422. Its totient is φ = 11401212420.

The previous prime is 11401212419. The next prime is 11401212437. The reversal of 11401212421 is 12421210411.

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., 9705008196 + 1696204225 = 98514^2 + 41185^2 .

It is a cyclic number.

It is not a de Polignac number, because 11401212421 - 2¹ = 11401212419 is a prime.

Together with 11401212419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11401212491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5700606210 + 5700606211.

It is an arithmetic number, because the mean of its divisors is an integer number (5700606211).

Almost surely, 2^11401212421 is an apocalyptic number.

It is an amenable number.

11401212421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11401212421 is an equidigital number, since it uses as much as digits as its factorization.

11401212421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 11401212421 its reverse (12421210411), we get a palindrome (23822422832).

The spelling of 11401212421 in words is "eleven billion, four hundred one million, two hundred twelve thousand, four hundred twenty-one".