21101221202002 has 4 divisors (see below), whose sum is σ = 31651831803006. Its totient is φ = 10550610601000.

The previous prime is 21101221201987. The next prime is 21101221202059. The reversal of 21101221202002 is 20020212210112.

It is a happy number.

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., 19611603393001 + 1489617809001 = 4428499^2 + 1220499^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275305300499 + ... + 5275305300502.

Almost surely, 2^{21101221202002} is an apocalyptic number.

21101221202002 is a deficient number, since it is larger than the sum of its proper divisors (10550610601004).

21101221202002 is a wasteful number, since it uses less digits than its factorization.

21101221202002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550610601003.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21101221202002 its reverse (20020212210112), we get a palindrome (41121433412114).

The spelling of 21101221202002 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, two hundred two thousand, two".