21212012011203 has 64 divisors (see below), whose sum is σ = 34737892882560. Its totient is φ = 12712427712000.

The previous prime is 21212012011187. The next prime is 21212012011207. The reversal of 21212012011203 is 30211021021212.

21212012011203 is a `hidden beast` number, since 212 + 120 + 120 + 11 + 203 = 666.

It is not a de Polignac number, because 21212012011203 - 2⁴ = 21212012011187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212012011207) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2741976 + ... + 7066997.

It is an arithmetic number, because the mean of its divisors is an integer number (542779576290).

Almost surely, 2^{21212012011203} is an apocalyptic number.

21212012011203 is a deficient number, since it is larger than the sum of its proper divisors (13525880871357).

21212012011203 is a wasteful number, since it uses less digits than its factorization.

21212012011203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9809157 (or 9809151 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21212012011203 its reverse (30211021021212), we get a palindrome (51423033032415).

The spelling of 21212012011203 in words is "twenty-one trillion, two hundred twelve billion, twelve million, eleven thousand, two hundred three".