21011002101010 has 8 divisors (see below), whose sum is σ = 37819803781836. Its totient is φ = 8404400840400.

The previous prime is 21011002100999. The next prime is 21011002101049. The reversal of 21011002101010 is 1010120011012.

It can be written as a sum of positive squares in 2 ways, for example, as 19586280558321 + 1424721542689 = 4425639^2 + 1193617^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2101100210101 = 21011002101010 / (2 + 1 + 0 + 1 + 1 + 0 + 0 + 2 + 1 + 0 + 1 + 0 + 1 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050550105041 + ... + 1050550105060.

Almost surely, 2^{21011002101010} is an apocalyptic number.

21011002101010 is a deficient number, since it is larger than the sum of its proper divisors (16808801680826).

21011002101010 is a wasteful number, since it uses less digits than its factorization.

21011002101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101100210108.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21011002101010 its reverse (1010120011012), we get a palindrome (22021122112022).

The spelling of 21011002101010 in words is "twenty-one trillion, eleven billion, two million, one hundred one thousand, ten".