21102102134413 has 8 divisors (see below), whose sum is σ = 21118107706776. Its totient is φ = 21086097614400.

The previous prime is 21102102134383. The next prime is 21102102134429. The reversal of 21102102134413 is 31443120120112.

It can be written as a sum of positive squares in 4 ways, for example, as 73109129769 + 21028993004644 = 270387^2 + 4585738^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102102134413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102102134473) 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, 42482595 + ... + 42976447.

It is an arithmetic number, because the mean of its divisors is an integer number (2639763463347).

Almost surely, 2^{21102102134413} is an apocalyptic number.

It is an amenable number.

21102102134413 is a deficient number, since it is larger than the sum of its proper divisors (16005572363).

21102102134413 is a wasteful number, since it uses less digits than its factorization.

21102102134413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526175.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21102102134413 its reverse (31443120120112), we get a palindrome (52545222254525).

The spelling of 21102102134413 in words is "twenty-one trillion, one hundred two billion, one hundred two million, one hundred thirty-four thousand, four hundred thirteen".