15422021 has 2 divisors, whose sum is σ = 15422022. Its totient is φ = 15422020.

The previous prime is 15422003. The next prime is 15422023. The reversal of 15422021 is 12022451.

15422021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 1276900 = 3761^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 15422021 - 2¹⁸ = 15159877 is a prime.

Together with 15422023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15422023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7711010 + 7711011.

It is an arithmetic number, because the mean of its divisors is an integer number (7711011).

Almost surely, 2^15422021 is an apocalyptic number.

It is an amenable number.

15422021 is a deficient number, since it is larger than the sum of its proper divisors (1).

15422021 is an equidigital number, since it uses as much as digits as its factorization.

15422021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 15422021 is about 3927.0881069821. The cubic root of 15422021 is about 248.9127235078.

Adding to 15422021 its reverse (12022451), we get a palindrome (27444472).

The spelling of 15422021 in words is "fifteen million, four hundred twenty-two thousand, twenty-one".