21012120220203 has 48 divisors (see below), whose sum is σ = 35034410511360. Its totient is φ = 11886706775808.

The previous prime is 21012120220163. The next prime is 21012120220229. The reversal of 21012120220203 is 30202202121012.

21012120220203 is a `hidden beast` number, since 210 + 1 + 212 + 0 + 220 + 20 + 3 = 666.

It is not a de Polignac number, because 21012120220203 - 2¹² = 21012120216107 is a prime.

It is a super-2 number, since 2×21012120220203² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012020220203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8975763 + ... + 11071971.

It is an arithmetic number, because the mean of its divisors is an integer number (729883552320).

Almost surely, 2^{21012120220203} is an apocalyptic number.

21012120220203 is a deficient number, since it is larger than the sum of its proper divisors (14022290291157).

21012120220203 is a wasteful number, since it uses less digits than its factorization.

21012120220203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097816 (or 2097813 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21012120220203 its reverse (30202202121012), we get a palindrome (51214322341215).

The spelling of 21012120220203 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred twenty thousand, two hundred three".