47011721 has 2 divisors, whose sum is σ = 47011722. Its totient is φ = 47011720.

The previous prime is 47011649. The next prime is 47011733. The reversal of 47011721 is 12711074.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 9066121 = 6160^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 47011721 - 2¹⁴ = 46995337 is a prime.

It is a super-2 number, since 2×47011721² = 4420203822763682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (47011751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23505860 + 23505861.

It is an arithmetic number, because the mean of its divisors is an integer number (23505861).

Almost surely, 2^47011721 is an apocalyptic number.

It is an amenable number.

47011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

47011721 is an equidigital number, since it uses as much as digits as its factorization.

47011721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 47011721 is about 6856.5093888946. The cubic root of 47011721 is about 360.9126048470.

Adding to 47011721 its reverse (12711074), we get a palindrome (59722795).

The spelling of 47011721 in words is "forty-seven million, eleven thousand, seven hundred twenty-one".