21312211021203 has 8 divisors (see below), whose sum is σ = 28840404964288. Its totient is φ = 13996078879464.

The previous prime is 21312211021183. The next prime is 21312211021217. The reversal of 21312211021203 is 30212011221312.

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

It is not a de Polignac number, because 21312211021203 - 2³⁶ = 21243491544467 is a prime.

It is a super-2 number, since 2×21312211021203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21312211021203.

It is not an unprimeable number, because it can be changed into a prime (21312211021223) 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, 53015450101 + ... + 53015450502.

It is an arithmetic number, because the mean of its divisors is an integer number (3605050620536).

Almost surely, 2^{21312211021203} is an apocalyptic number.

21312211021203 is a deficient number, since it is larger than the sum of its proper divisors (7528193943085).

21312211021203 is a wasteful number, since it uses less digits than its factorization.

21312211021203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106030900673.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21312211021203 its reverse (30212011221312), we get a palindrome (51524222242515).

The spelling of 21312211021203 in words is "twenty-one trillion, three hundred twelve billion, two hundred eleven million, twenty-one thousand, two hundred three".