11477172121 has 2 divisors, whose sum is σ = 11477172122. Its totient is φ = 11477172120.

The previous prime is 11477172071. The next prime is 11477172127. The reversal of 11477172121 is 12127177411.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8922880521 + 2554291600 = 94461^2 + 50540^2 .

It is a cyclic number.

It is not a de Polignac number, because 11477172121 - 2¹⁵ = 11477139353 is a prime.

It is not a weakly prime, because it can be changed into another prime (11477172127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5738586060 + 5738586061.

It is an arithmetic number, because the mean of its divisors is an integer number (5738586061).

Almost surely, 2^11477172121 is an apocalyptic number.

It is an amenable number.

11477172121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11477172121 is an equidigital number, since it uses as much as digits as its factorization.

11477172121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5488, while the sum is 34.

The spelling of 11477172121 in words is "eleven billion, four hundred seventy-seven million, one hundred seventy-two thousand, one hundred twenty-one".