21214601 has 4 divisors (see below), whose sum is σ = 21420672. Its totient is φ = 21008532.

The previous prime is 21214577. The next prime is 21214619. The reversal of 21214601 is 10641212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21214601 - 2¹⁸ = 20952457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21214601.

It is not an unprimeable number, because it can be changed into a prime (21214651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102881 + ... + 103086.

It is an arithmetic number, because the mean of its divisors is an integer number (5355168).

Almost surely, 2^21214601 is an apocalyptic number.

It is an amenable number.

21214601 is a deficient number, since it is larger than the sum of its proper divisors (206071).

21214601 is a wasteful number, since it uses less digits than its factorization.

21214601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206070.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21214601 is about 4605.9310676561. The cubic root of 21214601 is about 276.8290247180.

Adding to 21214601 its reverse (10641212), we get a palindrome (31855813).

The spelling of 21214601 in words is "twenty-one million, two hundred fourteen thousand, six hundred one".