47121215381 has 2 divisors, whose sum is σ = 47121215382. Its totient is φ = 47121215380.

The previous prime is 47121215371. The next prime is 47121215389. The reversal of 47121215381 is 18351212174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41801847025 + 5319368356 = 204455^2 + 72934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47121215381 is a prime.

It is a super-2 number, since 2×47121215381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47121215389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23560607690 + 23560607691.

It is an arithmetic number, because the mean of its divisors is an integer number (23560607691).

Almost surely, 2^47121215381 is an apocalyptic number.

It is an amenable number.

47121215381 is a deficient number, since it is larger than the sum of its proper divisors (1).

47121215381 is an equidigital number, since it uses as much as digits as its factorization.

47121215381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The spelling of 47121215381 in words is "forty-seven billion, one hundred twenty-one million, two hundred fifteen thousand, three hundred eighty-one".