47212021 has 2 divisors, whose sum is σ = 47212022. Its totient is φ = 47212020.

The previous prime is 47212013. The next prime is 47212103. The reversal of 47212021 is 12021274.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 12567025 = 5886^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 47212021 - 2³ = 47212013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47212021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23606010 + 23606011.

It is an arithmetic number, because the mean of its divisors is an integer number (23606011).

Almost surely, 2^47212021 is an apocalyptic number.

It is an amenable number.

47212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47212021 is an equidigital number, since it uses as much as digits as its factorization.

47212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 47212021 is about 6871.1004213299. The cubic root of 47212021 is about 361.4244514476.

Adding to 47212021 its reverse (12021274), we get a palindrome (59233295).

The spelling of 47212021 in words is "forty-seven million, two hundred twelve thousand, twenty-one".