21000203213 has 8 divisors (see below), whose sum is σ = 22982509056. Its totient is φ = 19030096800.

The previous prime is 21000203177. The next prime is 21000203233. The reversal of 21000203213 is 31230200012.

It is a happy number.

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

It is not a de Polignac number, because 21000203213 - 2⁶ = 21000203149 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 (21000203233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3046253 + ... + 3053138.

It is an arithmetic number, because the mean of its divisors is an integer number (2872813632).

Almost surely, 2^21000203213 is an apocalyptic number.

It is an amenable number.

21000203213 is a deficient number, since it is larger than the sum of its proper divisors (1982305843).

21000203213 is a wasteful number, since it uses less digits than its factorization.

21000203213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6099715.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000203213 its reverse (31230200012), we get a palindrome (52230403225).

The spelling of 21000203213 in words is "twenty-one billion, two hundred three thousand, two hundred thirteen".