20211377 has 2 divisors, whose sum is σ = 20211378. Its totient is φ = 20211376.

The previous prime is 20211263. The next prime is 20211379. The reversal of 20211377 is 77311202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 2436721 = 4216^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211377 - 2¹² = 20207281 is a prime.

It is a super-2 number, since 2×20211377² = 816999520472258, which contains 22 as substring.

Together with 20211379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20211379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105688 + 10105689.

It is an arithmetic number, because the mean of its divisors is an integer number (10105689).

Almost surely, 2^20211377 is an apocalyptic number.

It is an amenable number.

20211377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211377 is an equidigital number, since it uses as much as digits as its factorization.

20211377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 20211377 is about 4495.7065073245. The cubic root of 20211377 is about 272.3946881446.

Adding to 20211377 its reverse (77311202), we get a palindrome (97522579).

The spelling of 20211377 in words is "twenty million, two hundred eleven thousand, three hundred seventy-seven".