21422077 has 2 divisors, whose sum is σ = 21422078. Its totient is φ = 21422076.

The previous prime is 21422053. The next prime is 21422099. The reversal of 21422077 is 77022412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21399876 + 22201 = 4626^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422077 - 2²³ = 13033469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711038 + 10711039.

It is an arithmetic number, because the mean of its divisors is an integer number (10711039).

Almost surely, 2^21422077 is an apocalyptic number.

It is an amenable number.

21422077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422077 is an equidigital number, since it uses as much as digits as its factorization.

21422077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 21422077 is about 4628.3989672456. The cubic root of 21422077 is about 277.7285491012.

Adding to 21422077 its reverse (77022412), we get a palindrome (98444489).

The spelling of 21422077 in words is "twenty-one million, four hundred twenty-two thousand, seventy-seven".