21201001213 has 4 divisors (see below), whose sum is σ = 24229715680. Its totient is φ = 18172286748.

The previous prime is 21201001207. The next prime is 21201001219. The reversal of 21201001213 is 31210010212.

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 an interprime number because it is at equal distance from previous prime (21201001207) and next prime (21201001219).

It is not a de Polignac number, because 21201001213 - 2²⁹ = 20664130301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201001193 and 21201001202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201001219) 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, 1514357223 + ... + 1514357236.

It is an arithmetic number, because the mean of its divisors is an integer number (6057428920).

Almost surely, 2^21201001213 is an apocalyptic number.

It is an amenable number.

21201001213 is a deficient number, since it is larger than the sum of its proper divisors (3028714467).

21201001213 is an equidigital number, since it uses as much as digits as its factorization.

21201001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028714466.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21201001213 its reverse (31210010212), we get a palindrome (52411011425).

The spelling of 21201001213 in words is "twenty-one billion, two hundred one million, one thousand, two hundred thirteen".