20211077 has 2 divisors, whose sum is σ = 20211078. Its totient is φ = 20211076.

The previous prime is 20211031. The next prime is 20211097. The reversal of 20211077 is 77011202.

It is an a-pointer prime, because the next prime (20211097) can be obtained adding 20211077 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13315201 + 6895876 = 3649^2 + 2626^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211077 - 2¹² = 20206981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105538 + 10105539.

It is an arithmetic number, because the mean of its divisors is an integer number (10105539).

Almost surely, 2^20211077 is an apocalyptic number.

It is an amenable number.

20211077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211077 is an equidigital number, since it uses as much as digits as its factorization.

20211077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 20211077 is about 4495.6731420333. The cubic root of 20211077 is about 272.3933404084.

Adding to 20211077 its reverse (77011202), we get a palindrome (97222279).

The spelling of 20211077 in words is "twenty million, two hundred eleven thousand, seventy-seven".