21772433 has 2 divisors, whose sum is σ = 21772434. Its totient is φ = 21772432.

The previous prime is 21772381. The next prime is 21772441. The reversal of 21772433 is 33427712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 3179089 = 4312^2 + 1783^2 .

It is a cyclic number.

It is not a de Polignac number, because 21772433 - 2⁶ = 21772369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21772396 and 21772405.

It is not a weakly prime, because it can be changed into another prime (21772033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10886216 + 10886217.

It is an arithmetic number, because the mean of its divisors is an integer number (10886217).

Almost surely, 2^21772433 is an apocalyptic number.

It is an amenable number.

21772433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21772433 is an equidigital number, since it uses as much as digits as its factorization.

21772433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 29.

The square root of 21772433 is about 4666.0939767647. The cubic root of 21772433 is about 279.2344436411.

The spelling of 21772433 in words is "twenty-one million, seven hundred seventy-two thousand, four hundred thirty-three".