21875629 has 2 divisors, whose sum is σ = 21875630. Its totient is φ = 21875628.

The previous prime is 21875611. The next prime is 21875647. The reversal of 21875629 is 92657812.

It is a balanced prime because it is at equal distance from previous prime (21875611) and next prime (21875647).

It can be written as a sum of positive squares in only one way, i.e., 21178404 + 697225 = 4602^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 21875629 - 2²³ = 13487021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21875591 and 21875600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21875699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10937814 + 10937815.

It is an arithmetic number, because the mean of its divisors is an integer number (10937815).

Almost surely, 2^21875629 is an apocalyptic number.

It is an amenable number.

21875629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21875629 is an equidigital number, since it uses as much as digits as its factorization.

21875629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 21875629 is about 4677.1389759125. The cubic root of 21875629 is about 279.6749160864.

The spelling of 21875629 in words is "twenty-one million, eight hundred seventy-five thousand, six hundred twenty-nine".