21770701 has 2 divisors, whose sum is σ = 21770702. Its totient is φ = 21770700.

The previous prime is 21770687. The next prime is 21770731. The reversal of 21770701 is 10707712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15792676 + 5978025 = 3974^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 21770701 - 2¹³ = 21762509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21770731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10885350 + 10885351.

It is an arithmetic number, because the mean of its divisors is an integer number (10885351).

Almost surely, 2^21770701 is an apocalyptic number.

It is an amenable number.

21770701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21770701 is an equidigital number, since it uses as much as digits as its factorization.

21770701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 686, while the sum is 25.

The square root of 21770701 is about 4665.9083788690. The cubic root of 21770701 is about 279.2270390654.

The spelling of 21770701 in words is "twenty-one million, seven hundred seventy thousand, seven hundred one".