21221222122203 has 16 divisors (see below), whose sum is σ = 29999912883840. Its totient is φ = 13297258636416.

The previous prime is 21221222122181. The next prime is 21221222122249. The reversal of 21221222122203 is 30222122212212.

It is not a de Polignac number, because 21221222122203 - 2⁵ = 21221222122171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221222124203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281493025 + ... + 281568402.

It is an arithmetic number, because the mean of its divisors is an integer number (1874994555240).

Almost surely, 2^{21221222122203} is an apocalyptic number.

21221222122203 is a deficient number, since it is larger than the sum of its proper divisors (8778690761637).

21221222122203 is a wasteful number, since it uses less digits than its factorization.

21221222122203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563062186.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21221222122203 its reverse (30222122212212), we get a palindrome (51443344334415).

Subtracting 21221222122203 from its reverse (30222122212212), we obtain a palindrome (9000900090009).

The spelling of 21221222122203 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred three".