213321410021 has 4 divisors (see below), whose sum is σ = 216937027200. Its totient is φ = 209705792844.

The previous prime is 213321409969. The next prime is 213321410023. The reversal of 213321410021 is 120014123312.

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 a de Polignac number, because none of the positive numbers 2^k-213321410021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213321409975 and 213321410002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213321410023) 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, 1807808501 + ... + 1807808618.

It is an arithmetic number, because the mean of its divisors is an integer number (54234256800).

Almost surely, 2^213321410021 is an apocalyptic number.

It is an amenable number.

213321410021 is a deficient number, since it is larger than the sum of its proper divisors (3615617179).

213321410021 is an equidigital number, since it uses as much as digits as its factorization.

213321410021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615617178.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213321410021 its reverse (120014123312), we get a palindrome (333335533333).

The spelling of 213321410021 in words is "two hundred thirteen billion, three hundred twenty-one million, four hundred ten thousand, twenty-one".