21221221333203 has 32 divisors (see below), whose sum is σ = 32328359454720. Its totient is φ = 13748142998880.

The previous prime is 21221221333181. The next prime is 21221221333211. The reversal of 21221221333203 is 30233312212212.

21221221333203 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 122 + 1 + 333 + 203 = 666.

It is not a de Polignac number, because 21221221333203 - 2⁵ = 21221221333171 is a prime.

It is a super-2 number, since 2×21221221333203² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21221221333243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12286275 + ... + 13906652.

It is an arithmetic number, because the mean of its divisors is an integer number (1010261232960).

Almost surely, 2^{21221221333203} is an apocalyptic number.

21221221333203 is a deficient number, since it is larger than the sum of its proper divisors (11107138121517).

21221221333203 is a wasteful number, since it uses less digits than its factorization.

21221221333203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26193784 (or 26193778 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21221221333203 its reverse (30233312212212), we get a palindrome (51454533545415).

The spelling of 21221221333203 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, three hundred thirty-three thousand, two hundred three".