21003213201 has 4 divisors (see below), whose sum is σ = 28004284272. Its totient is φ = 14002142132.

The previous prime is 21003213097. The next prime is 21003213221. The reversal of 21003213201 is 10231230012.

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 not a de Polignac number, because 21003213201 - 2¹⁴ = 21003196817 is a prime.

It is a super-2 number, since 2×21003213201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003213221) 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, 3500535531 + ... + 3500535536.

It is an arithmetic number, because the mean of its divisors is an integer number (7001071068).

Almost surely, 2^21003213201 is an apocalyptic number.

It is an amenable number.

21003213201 is a deficient number, since it is larger than the sum of its proper divisors (7001071071).

21003213201 is an equidigital number, since it uses as much as digits as its factorization.

21003213201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001071070.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21003213201 its reverse (10231230012), we get a palindrome (31234443213).

The spelling of 21003213201 in words is "twenty-one billion, three million, two hundred thirteen thousand, two hundred one".