21210203132113 has 4 divisors (see below), whose sum is σ = 21213105068980. Its totient is φ = 21207301195248.

The previous prime is 21210203132057. The next prime is 21210203132117. The reversal of 21210203132113 is 31123130201212.

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 13973070135249 + 7237132996864 = 3738057^2 + 2690192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210203132113 is a prime.

It is a super-2 number, since 2×21210203132113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210203132117) 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, 1450957470 + ... + 1450972087.

It is an arithmetic number, because the mean of its divisors is an integer number (5303276267245).

Almost surely, 2^{21210203132113} is an apocalyptic number.

It is an amenable number.

21210203132113 is a deficient number, since it is larger than the sum of its proper divisors (2901936867).

21210203132113 is an equidigital number, since it uses as much as digits as its factorization.

21210203132113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901936866.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21210203132113 its reverse (31123130201212), we get a palindrome (52333333333325).

The spelling of 21210203132113 in words is "twenty-one trillion, two hundred ten billion, two hundred three million, one hundred thirty-two thousand, one hundred thirteen".