21100443400202 has 4 divisors (see below), whose sum is σ = 31650665100306. Its totient is φ = 10550221700100.

The previous prime is 21100443400199. The next prime is 21100443400229. The reversal of 21100443400202 is 20200434400112.

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

It can be written as a sum of positive squares in only one way, i.e., 17365380818041 + 3735062582161 = 4167179^2 + 1932631^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275110850049 + ... + 5275110850052.

Almost surely, 2^{21100443400202} is an apocalyptic number.

21100443400202 is a deficient number, since it is larger than the sum of its proper divisors (10550221700104).

21100443400202 is a wasteful number, since it uses less digits than its factorization.

21100443400202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550221700103.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21100443400202 its reverse (20200434400112), we get a palindrome (41300877800314).

The spelling of 21100443400202 in words is "twenty-one trillion, one hundred billion, four hundred forty-three million, four hundred thousand, two hundred two".