21101701 has 2 divisors, whose sum is σ = 21101702. Its totient is φ = 21101700.

The previous prime is 21101687. The next prime is 21101737. The reversal of 21101701 is 10710112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15413476 + 5688225 = 3926^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101701 - 2¹³ = 21093509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550850 + 10550851.

It is an arithmetic number, because the mean of its divisors is an integer number (10550851).

Almost surely, 2^21101701 is an apocalyptic number.

It is an amenable number.

21101701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101701 is an equidigital number, since it uses as much as digits as its factorization.

21101701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 21101701 is about 4593.6587814073. The cubic root of 21101701 is about 276.3370741667.

Adding to 21101701 its reverse (10710112), we get a palindrome (31811813).

The spelling of 21101701 in words is "twenty-one million, one hundred one thousand, seven hundred one".