21952339 has 2 divisors, whose sum is σ = 21952340. Its totient is φ = 21952338.

The previous prime is 21952313. The next prime is 21952387. The reversal of 21952339 is 93325912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21952339 - 2⁹ = 21951827 is a prime.

It is a super-3 number, since 3×21952339³ (a number of 23 digits) contains 333 as substring.

It is equal to p_1386475 and since 21952339 and 1386475 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21952639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10976169 + 10976170.

It is an arithmetic number, because the mean of its divisors is an integer number (10976170).

Almost surely, 2^21952339 is an apocalyptic number.

21952339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21952339 is an equidigital number, since it uses as much as digits as its factorization.

21952339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 34.

The square root of 21952339 is about 4685.3323254600. The cubic root of 21952339 is about 280.0014413191.

The spelling of 21952339 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred thirty-nine".