21203031323333 has 4 divisors (see below), whose sum is σ = 21203117018988. Its totient is φ = 21202945627680.

The previous prime is 21203031323311. The next prime is 21203031323351. The reversal of 21203031323333 is 33332313030212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11944198657444 + 9258832665889 = 3456038^2 + 3042833^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203031323333 - 2¹⁶ = 21203031257797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21203031323296 and 21203031323305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203031023333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42475616 + ... + 42971897.

It is an arithmetic number, because the mean of its divisors is an integer number (5300779254747).

Almost surely, 2^{21203031323333} is an apocalyptic number.

It is an amenable number.

21203031323333 is a deficient number, since it is larger than the sum of its proper divisors (85695655).

21203031323333 is an equidigital number, since it uses as much as digits as its factorization.

21203031323333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85695654.

The product of its (nonzero) digits is 17496, while the sum is 29.

Adding to 21203031323333 its reverse (33332313030212), we get a palindrome (54535344353545).

The spelling of 21203031323333 in words is "twenty-one trillion, two hundred three billion, thirty-one million, three hundred twenty-three thousand, three hundred thirty-three".