213021401 has 4 divisors (see below), whose sum is σ = 213053412. Its totient is φ = 212989392.

The previous prime is 213021379. The next prime is 213021427. The reversal of 213021401 is 104120312.

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 57395776 + 155625625 = 7576^2 + 12475^2 .

It is a cyclic number.

It is not a de Polignac number, because 213021401 - 2⁶ = 213021337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213021451) 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, 1850 + ... + 20723.

It is an arithmetic number, because the mean of its divisors is an integer number (53263353).

Almost surely, 2^213021401 is an apocalyptic number.

It is an amenable number.

213021401 is a deficient number, since it is larger than the sum of its proper divisors (32011).

213021401 is an equidigital number, since it uses as much as digits as its factorization.

213021401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32010.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 213021401 is about 14595.2526870897. The cubic root of 213021401 is about 597.2292626828.

Adding to 213021401 its reverse (104120312), we get a palindrome (317141713).

The spelling of 213021401 in words is "two hundred thirteen million, twenty-one thousand, four hundred one".