213241621 has 4 divisors (see below), whose sum is σ = 215312032. Its totient is φ = 211171212.

The previous prime is 213241607. The next prime is 213241643. The reversal of 213241621 is 126142312.

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 213241621 - 2⁷ = 213241493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213241592 and 213241601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213241661) 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, 1035051 + ... + 1035256.

It is an arithmetic number, because the mean of its divisors is an integer number (53828008).

Almost surely, 2^213241621 is an apocalyptic number.

It is an amenable number.

213241621 is a deficient number, since it is larger than the sum of its proper divisors (2070411).

213241621 is a wasteful number, since it uses less digits than its factorization.

213241621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070410.

The product of its digits is 576, while the sum is 22.

The square root of 213241621 is about 14602.7949721962. The cubic root of 213241621 is about 597.4349955833.

Adding to 213241621 its reverse (126142312), we get a palindrome (339383933).

The spelling of 213241621 in words is "two hundred thirteen million, two hundred forty-one thousand, six hundred twenty-one".