21102377 has 2 divisors, whose sum is σ = 21102378. Its totient is φ = 21102376.

The previous prime is 21102313. The next prime is 21102383. The reversal of 21102377 is 77320112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18181696 + 2920681 = 4264^2 + 1709^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102377 - 2⁶ = 21102313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551188 + 10551189.

It is an arithmetic number, because the mean of its divisors is an integer number (10551189).

Almost surely, 2^21102377 is an apocalyptic number.

It is an amenable number.

21102377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102377 is an equidigital number, since it uses as much as digits as its factorization.

21102377 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 21102377 is about 4593.7323605104. The cubic root of 21102377 is about 276.3400249852.

Adding to 21102377 its reverse (77320112), we get a palindrome (98422489).

The spelling of 21102377 in words is "twenty-one million, one hundred two thousand, three hundred seventy-seven".