47722021 has 2 divisors, whose sum is σ = 47722022. Its totient is φ = 47722020.

The previous prime is 47722013. The next prime is 47722027. The reversal of 47722021 is 12022774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39513796 + 8208225 = 6286^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 47722021 - 2³ = 47722013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47722027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23861010 + 23861011.

It is an arithmetic number, because the mean of its divisors is an integer number (23861011).

Almost surely, 2^47722021 is an apocalyptic number.

It is an amenable number.

47722021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47722021 is an equidigital number, since it uses as much as digits as its factorization.

47722021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 47722021 is about 6908.1126945064. The cubic root of 47722021 is about 362.7212024472.

Adding to 47722021 its reverse (12022774), we get a palindrome (59744795).

The spelling of 47722021 in words is "forty-seven million, seven hundred twenty-two thousand, twenty-one".