11211402421 has 2 divisors, whose sum is σ = 11211402422. Its totient is φ = 11211402420.

The previous prime is 11211402413. The next prime is 11211402439. The reversal of 11211402421 is 12420411211.

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., 10149555025 + 1061847396 = 100745^2 + 32586^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211402421 - 2³ = 11211402413 is a prime.

It is a super-2 number, since 2×11211402421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211402451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605701210 + 5605701211.

It is an arithmetic number, because the mean of its divisors is an integer number (5605701211).

Almost surely, 2^11211402421 is an apocalyptic number.

It is an amenable number.

11211402421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211402421 is an equidigital number, since it uses as much as digits as its factorization.

11211402421 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11211402421 its reverse (12420411211), we get a palindrome (23631813632).

The spelling of 11211402421 in words is "eleven billion, two hundred eleven million, four hundred two thousand, four hundred twenty-one".