213220001 has 4 divisors (see below), whose sum is σ = 225762372. Its totient is φ = 200677632.

The previous prime is 213219983. The next prime is 213220009. The reversal of 213220001 is 100022312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150430225 + 62789776 = 12265^2 + 7924^2 .

It is a cyclic number.

It is not a de Polignac number, because 213220001 - 2²⁶ = 146111137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213220009) 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, 6271160 + ... + 6271193.

It is an arithmetic number, because the mean of its divisors is an integer number (56440593).

Almost surely, 2^213220001 is an apocalyptic number.

It is an amenable number.

213220001 is a deficient number, since it is larger than the sum of its proper divisors (12542371).

213220001 is a wasteful number, since it uses less digits than its factorization.

213220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12542370.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 213220001 is about 14602.0546841874. The cubic root of 213220001 is about 597.4148041200.

Adding to 213220001 its reverse (100022312), we get a palindrome (313242313).

The spelling of 213220001 in words is "two hundred thirteen million, two hundred twenty thousand, one".