21838801 has 2 divisors, whose sum is σ = 21838802. Its totient is φ = 21838800.

The previous prime is 21838763. The next prime is 21838811. The reversal of 21838801 is 10883812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 123201 = 4660^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 21838801 - 2²¹ = 19741649 is a prime.

It is not a weakly prime, because it can be changed into another prime (21838811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919400 + 10919401.

It is an arithmetic number, because the mean of its divisors is an integer number (10919401).

Almost surely, 2^21838801 is an apocalyptic number.

It is an amenable number.

21838801 is a deficient number, since it is larger than the sum of its proper divisors (1).

21838801 is an equidigital number, since it uses as much as digits as its factorization.

21838801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 21838801 is about 4673.2002953009. The cubic root of 21838801 is about 279.5178820765.

The spelling of 21838801 in words is "twenty-one million, eight hundred thirty-eight thousand, eight hundred one".