21001012100010 has 48 divisors (see below), whose sum is σ = 55216144194120. Its totient is φ = 5537345510400.

The previous prime is 21001012100009. The next prime is 21001012100039. The reversal of 21001012100010 is 1000121010012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11195026734609 + 9805985365401 = 3345897^2 + 3131451^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21001012099965 and 21001012100001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1310916591 + ... + 1310932610.

Almost surely, 2^{21001012100010} is an apocalyptic number.

21001012100010 is an abundant number, since it is smaller than the sum of its proper divisors (34215132094110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001012100010 is a wasteful number, since it uses less digits than its factorization.

21001012100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2621849303 (or 2621849300 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21001012100010 its reverse (1000121010012), we get a palindrome (22001133110022).

The spelling of 21001012100010 in words is "twenty-one trillion, one billion, twelve million, one hundred thousand, ten".