21933629 has 2 divisors, whose sum is σ = 21933630.
Its totient is φ = 21933628.
The previous prime is 21933623. The next prime is 21933641. The reversal of 21933629 is 92633912.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 21576025 + 357604 = 4645^2 + 598^2
It is a cyclic number.
It is not a de Polignac number, because 21933629 - 224 = 5156413 is a prime.
It is a super-2 number, since 2×219336292 = 962168162219282, which contains 22 as substring.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (21933623) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966814 + 10966815.
It is an arithmetic number, because the mean of its divisors is an integer number (10966815).
Almost surely, 221933629 is an apocalyptic number.
It is an amenable number.
21933629 is a deficient number, since it is larger than the sum of its proper divisors (1).
21933629 is an equidigital number, since it uses as much as digits as its factorization.
21933629 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 17496, while the sum is 35.
The square root of 21933629 is about 4683.3352431787.
The cubic root of 21933629 is about 279.9218702079.
The spelling of 21933629 in words is "twenty-one million, nine hundred thirty-three thousand, six hundred twenty-nine".