21202000331 has 4 divisors (see below), whose sum is σ = 21420577752. Its totient is φ = 20983422912.

The previous prime is 21202000327. The next prime is 21202000357. The reversal of 21202000331 is 13300020212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21202000331 - 2² = 21202000327 is a prime.

It is a super-2 number, since 2×21202000331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202009331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109288565 + ... + 109288758.

It is an arithmetic number, because the mean of its divisors is an integer number (5355144438).

Almost surely, 2^21202000331 is an apocalyptic number.

21202000331 is a deficient number, since it is larger than the sum of its proper divisors (218577421).

21202000331 is an equidigital number, since it uses as much as digits as its factorization.

21202000331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218577420.

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

Adding to 21202000331 its reverse (13300020212), we get a palindrome (34502020543).

The spelling of 21202000331 in words is "twenty-one billion, two hundred two million, three hundred thirty-one", and thus it is an aban number.