15472021 has 2 divisors, whose sum is σ = 15472022. Its totient is φ = 15472020.

The previous prime is 15472019. The next prime is 15472033. The reversal of 15472021 is 12027451.

It is a happy number.

15472021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8122500 + 7349521 = 2850^2 + 2711^2 .

It is an emirp because it is prime and its reverse (12027451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15472021 - 2¹ = 15472019 is a prime.

Together with 15472019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 15471983 and 15472001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15472001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7736010 + 7736011.

It is an arithmetic number, because the mean of its divisors is an integer number (7736011).

Almost surely, 2^15472021 is an apocalyptic number.

It is an amenable number.

15472021 is a deficient number, since it is larger than the sum of its proper divisors (1).

15472021 is an equidigital number, since it uses as much as digits as its factorization.

15472021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 15472021 is about 3933.4489954746. The cubic root of 15472021 is about 249.1814347288.

Adding to 15472021 its reverse (12027451), we get a palindrome (27499472).

The spelling of 15472021 in words is "fifteen million, four hundred seventy-two thousand, twenty-one".