21111021002002 has 4 divisors (see below), whose sum is σ = 31666531503006. Its totient is φ = 10555510501000.

The previous prime is 21111021001909. The next prime is 21111021002047. The reversal of 21111021002002 is 20020012011112.

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., 14233257744601 + 6877763257401 = 3772699^2 + 2622549^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277755250499 + ... + 5277755250502.

Almost surely, 2^{21111021002002} is an apocalyptic number.

21111021002002 is a deficient number, since it is larger than the sum of its proper divisors (10555510501004).

21111021002002 is a wasteful number, since it uses less digits than its factorization.

21111021002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555510501003.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111021002002 its reverse (20020012011112), we get a palindrome (41131033013114).

The spelling of 21111021002002 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, two thousand, two".