21893629 has 2 divisors, whose sum is σ = 21893630. Its totient is φ = 21893628.

The previous prime is 21893621. The next prime is 21893633. The reversal of 21893629 is 92639812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 1625625 = 4502^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 21893629 - 2³ = 21893621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21893591 and 21893600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21893621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946814 + 10946815.

It is an arithmetic number, because the mean of its divisors is an integer number (10946815).

Almost surely, 2^21893629 is an apocalyptic number.

It is an amenable number.

21893629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893629 is an equidigital number, since it uses as much as digits as its factorization.

21893629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 21893629 is about 4679.0628335170. The cubic root of 21893629 is about 279.7516036850.

It can be divided in two parts, 21893 and 629, that added together give a palindrome (22522).

The spelling of 21893629 in words is "twenty-one million, eight hundred ninety-three thousand, six hundred twenty-nine".