21120203 has 8 divisors (see below), whose sum is σ = 22780800. Its totient is φ = 19464768.

The previous prime is 21120193. The next prime is 21120223. The reversal of 21120203 is 30202112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21120203 - 2⁶ = 21120139 is a prime.

It is a super-2 number, since 2×21120203² = 892125949522418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120223) 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, 13958 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (2847600).

Almost surely, 2^21120203 is an apocalyptic number.

21120203 is a deficient number, since it is larger than the sum of its proper divisors (1660597).

21120203 is a wasteful number, since it uses less digits than its factorization.

21120203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21120203 is about 4595.6722032800. The cubic root of 21120203 is about 276.4178148137.

Adding to 21120203 its reverse (30202112), we get a palindrome (51322315).

The spelling of 21120203 in words is "twenty-one million, one hundred twenty thousand, two hundred three".