213421300021 has 8 divisors (see below), whose sum is σ = 218390812640. Its totient is φ = 208452070512.

The previous prime is 213421300007. The next prime is 213421300039. The reversal of 213421300021 is 120003124312.

It is a happy number.

213421300021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213421300021 - 2¹⁷ = 213421168949 is a prime.

It is a super-4 number, since 4×213421300021⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213421300321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2721466 + ... + 2798788.

It is an arithmetic number, because the mean of its divisors is an integer number (27298851580).

Almost surely, 2^213421300021 is an apocalyptic number.

It is an amenable number.

213421300021 is a deficient number, since it is larger than the sum of its proper divisors (4969512619).

213421300021 is an equidigital number, since it uses as much as digits as its factorization.

213421300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141555.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 213421300021 its reverse (120003124312), we get a palindrome (333424424333).

The spelling of 213421300021 in words is "two hundred thirteen billion, four hundred twenty-one million, three hundred thousand, twenty-one".