21012121202002 has 8 divisors (see below), whose sum is σ = 36020779203456. Its totient is φ = 9005194800852.

The previous prime is 21012121201997. The next prime is 21012121202011. The reversal of 21012121202002 is 20020212121012.

It is a happy number.

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

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 in 3 ways as a sum of consecutive naturals, for example, 750432900058 + ... + 750432900085.

It is an arithmetic number, because the mean of its divisors is an integer number (4502597400432).

Almost surely, 2^{21012121202002} is an apocalyptic number.

21012121202002 is a deficient number, since it is larger than the sum of its proper divisors (15008658001454).

21012121202002 is a wasteful number, since it uses less digits than its factorization.

21012121202002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500865800152.

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

Adding to 21012121202002 its reverse (20020212121012), we get a palindrome (41032333323014).

The spelling of 21012121202002 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, two hundred two thousand, two".