21020212203 has 4 divisors (see below), whose sum is σ = 28026949608. Its totient is φ = 14013474800.

The previous prime is 21020212159. The next prime is 21020212219. The reversal of 21020212203 is 30221202012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020212203 is a prime.

It is a super-2 number, since 2×21020212203² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020212403) 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, 3503368698 + ... + 3503368703.

It is an arithmetic number, because the mean of its divisors is an integer number (7006737402).

Almost surely, 2^21020212203 is an apocalyptic number.

21020212203 is a deficient number, since it is larger than the sum of its proper divisors (7006737405).

21020212203 is an equidigital number, since it uses as much as digits as its factorization.

21020212203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006737404.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21020212203 its reverse (30221202012), we get a palindrome (51241414215).

The spelling of 21020212203 in words is "twenty-one billion, twenty million, two hundred twelve thousand, two hundred three".