11231221012421 has 2 divisors, whose sum is σ = 11231221012422. Its totient is φ = 11231221012420.

The previous prime is 11231221012309. The next prime is 11231221012441. The reversal of 11231221012421 is 12421012213211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10483601389921 + 747619622500 = 3237839^2 + 864650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11231221012421 is a prime.

It is a super-2 number, since 2×11231221012421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231221012441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615610506210 + 5615610506211.

It is an arithmetic number, because the mean of its divisors is an integer number (5615610506211).

Almost surely, 2^{11231221012421} is an apocalyptic number.

It is an amenable number.

11231221012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231221012421 is an equidigital number, since it uses as much as digits as its factorization.

11231221012421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 11231221012421 its reverse (12421012213211), we get a palindrome (23652233225632).

The spelling of 11231221012421 in words is "eleven trillion, two hundred thirty-one billion, two hundred twenty-one million, twelve thousand, four hundred twenty-one".