21220120203 has 8 divisors (see below), whose sum is σ = 28757321616. Its totient is φ = 13914832800.

The previous prime is 21220120199. The next prime is 21220120219. The reversal of 21220120203 is 30202102212.

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 21220120203 - 2² = 21220120199 is a prime.

It is a super-2 number, since 2×21220120203² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220120223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57978288 + ... + 57978653.

It is an arithmetic number, because the mean of its divisors is an integer number (3594665202).

Almost surely, 2^21220120203 is an apocalyptic number.

21220120203 is a deficient number, since it is larger than the sum of its proper divisors (7537201413).

21220120203 is a wasteful number, since it uses less digits than its factorization.

21220120203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115957005.

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

Adding to 21220120203 its reverse (30202102212), we get a palindrome (51422222415).

The spelling of 21220120203 in words is "twenty-one billion, two hundred twenty million, one hundred twenty thousand, two hundred three".