21927833 has 2 divisors, whose sum is σ = 21927834. Its totient is φ = 21927832.

The previous prime is 21927823. The next prime is 21927847. The reversal of 21927833 is 33872912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17205904 + 4721929 = 4148^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21927833 - 2⁴ = 21927817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21927793 and 21927802.

It is not a weakly prime, because it can be changed into another prime (21927823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10963916 + 10963917.

It is an arithmetic number, because the mean of its divisors is an integer number (10963917).

Almost surely, 2^21927833 is an apocalyptic number.

It is an amenable number.

21927833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21927833 is an equidigital number, since it uses as much as digits as its factorization.

21927833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 21927833 is about 4682.7164125110. The cubic root of 21927833 is about 279.8972114204.

The spelling of 21927833 in words is "twenty-one million, nine hundred twenty-seven thousand, eight hundred thirty-three".