21211001213 has 8 divisors (see below), whose sum is σ = 21943479096. Its totient is φ = 20488768000.

The previous prime is 21211001197. The next prime is 21211001219. The reversal of 21211001213 is 31210011212.

It can be written as a sum of positive squares in 4 ways, for example, as 10538664964 + 10672336249 = 102658^2 + 103307^2 .

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 21211001213 - 2⁴ = 21211001197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211001219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2556956 + ... + 2565237.

It is an arithmetic number, because the mean of its divisors is an integer number (2742934887).

Almost surely, 2^21211001213 is an apocalyptic number.

It is an amenable number.

21211001213 is a deficient number, since it is larger than the sum of its proper divisors (732477883).

21211001213 is a wasteful number, since it uses less digits than its factorization.

21211001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122335.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21211001213 its reverse (31210011212), we get a palindrome (52421012425).

Subtracting 21211001213 from its reverse (31210011212), we obtain a palindrome (9999009999).

The spelling of 21211001213 in words is "twenty-one billion, two hundred eleven million, one thousand, two hundred thirteen".