11213550121 has 2 divisors, whose sum is σ = 11213550122. Its totient is φ = 11213550120.

The previous prime is 11213550119. The next prime is 11213550181. The reversal of 11213550121 is 12105531211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6652033600 + 4561516521 = 81560^2 + 67539^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213550121 - 2¹ = 11213550119 is a prime.

It is a super-2 number, since 2×11213550121² (a number of 21 digits) contains 22 as substring.

Together with 11213550119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11213550092 and 11213550101.

It is not a weakly prime, because it can be changed into another prime (11213550181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606775060 + 5606775061.

It is an arithmetic number, because the mean of its divisors is an integer number (5606775061).

Almost surely, 2^11213550121 is an apocalyptic number.

It is an amenable number.

11213550121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213550121 is an equidigital number, since it uses as much as digits as its factorization.

11213550121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 22.

The spelling of 11213550121 in words is "eleven billion, two hundred thirteen million, five hundred fifty thousand, one hundred twenty-one".