21220203 has 8 divisors (see below), whose sum is σ = 29058448. Its totient is φ = 13764384.

The previous prime is 21220159. The next prime is 21220211. The reversal of 21220203 is 30202212.

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

It is not a de Polignac number, because 21220203 - 2²⁴ = 4442987 is a prime.

It is a super-2 number, since 2×21220203² = 900594030722418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220223) 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, 95476 + ... + 95697.

It is an arithmetic number, because the mean of its divisors is an integer number (3632306).

Almost surely, 2^21220203 is an apocalyptic number.

21220203 is a deficient number, since it is larger than the sum of its proper divisors (7838245).

21220203 is a wasteful number, since it uses less digits than its factorization.

21220203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191213.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21220203 is about 4606.5391564601. The cubic root of 21220203 is about 276.8533893794.

Adding to 21220203 its reverse (30202212), we get a palindrome (51422415).

Subtracting 21220203 from its reverse (30202212), we obtain a square (8982009 = 2997²).

The spelling of 21220203 in words is "twenty-one million, two hundred twenty thousand, two hundred three".