21700601 has 8 divisors (see below), whose sum is σ = 23507400. Its totient is φ = 19913472.

The previous prime is 21700597. The next prime is 21700621. The reversal of 21700601 is 10600712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 952576 + 20748025 = 976^2 + 4555^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21700601 - 2² = 21700597 is a prime.

It is a super-2 number, since 2×21700601² = 941832167522402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21700601.

It is not an unprimeable number, because it can be changed into a prime (21700621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2576 + ... + 7073.

It is an arithmetic number, because the mean of its divisors is an integer number (2938425).

Almost surely, 2^21700601 is an apocalyptic number.

It is an amenable number.

21700601 is a deficient number, since it is larger than the sum of its proper divisors (1806799).

21700601 is a wasteful number, since it uses less digits than its factorization.

21700601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9835.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21700601 is about 4658.3903872475. The cubic root of 21700601 is about 278.9270202185.

The spelling of 21700601 in words is "twenty-one million, seven hundred thousand, six hundred one".