21011210010002 has 4 divisors (see below), whose sum is σ = 31516815015006. Its totient is φ = 10505605005000.

The previous prime is 21011210009939. The next prime is 21011210010013. The reversal of 21011210010002 is 20001001211012.

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., 16959085295881 + 4052124714121 = 4118141^2 + 2012989^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252802502499 + ... + 5252802502502.

Almost surely, 2^{21011210010002} is an apocalyptic number.

21011210010002 is a deficient number, since it is larger than the sum of its proper divisors (10505605005004).

21011210010002 is a wasteful number, since it uses less digits than its factorization.

21011210010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505605005003.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011210010002 its reverse (20001001211012), we get a palindrome (41012211221014).

The spelling of 21011210010002 in words is "twenty-one trillion, eleven billion, two hundred ten million, ten thousand, two".