21213300001 has 4 divisors (see below), whose sum is σ = 21730697604. Its totient is φ = 20695902400.

The previous prime is 21213299999. The next prime is 21213300011. The reversal of 21213300001 is 10000331212.

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 4977443601 + 16235856400 = 70551^2 + 127420^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213300001 - 2¹ = 21213299999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213300011) 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, 258698740 + ... + 258698821.

It is an arithmetic number, because the mean of its divisors is an integer number (5432674401).

Almost surely, 2^21213300001 is an apocalyptic number.

It is an amenable number.

21213300001 is a deficient number, since it is larger than the sum of its proper divisors (517397603).

21213300001 is an equidigital number, since it uses as much as digits as its factorization.

21213300001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517397602.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21213300001 its reverse (10000331212), we get a palindrome (31213631213).

The spelling of 21213300001 in words is "twenty-one billion, two hundred thirteen million, three hundred thousand, one".