21350601 has 16 divisors (see below), whose sum is σ = 33006720. Its totient is φ = 13614480.

The previous prime is 21350597. The next prime is 21350611. The reversal of 21350601 is 10605312.

21350601 is a `hidden beast` number, since 2 + 13 + 50 + 601 = 666.

It is not a de Polignac number, because 21350601 - 2² = 21350597 is a prime.

It is a super-2 number, since 2×21350601² = 911696326122402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21350611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16570 + ... + 17811.

It is an arithmetic number, because the mean of its divisors is an integer number (2062920).

Almost surely, 2^21350601 is an apocalyptic number.

It is an amenable number.

21350601 is a deficient number, since it is larger than the sum of its proper divisors (11656119).

21350601 is a wasteful number, since it uses less digits than its factorization.

21350601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34413 (or 34407 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21350601 is about 4620.6710551607. The cubic root of 21350601 is about 277.4193191308.

Adding to 21350601 its reverse (10605312), we get a palindrome (31955913).

The spelling of 21350601 in words is "twenty-one million, three hundred fifty thousand, six hundred one".