21021212112002 has 8 divisors (see below), whose sum is σ = 31536609529212. Its totient is φ = 10509008935600.

The previous prime is 21021212112001. The next prime is 21021212112011. The reversal of 21021212112002 is 20021121212012.

It can be written as a sum of positive squares in 2 ways, for example, as 17938452215161 + 3082759896841 = 4235381^2 + 1755779^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21021212112001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798543749 + ... + 798570072.

Almost surely, 2^{21021212112002} is an apocalyptic number.

21021212112002 is a deficient number, since it is larger than the sum of its proper divisors (10515397417210).

21021212112002 is a wasteful number, since it uses less digits than its factorization.

21021212112002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597120404.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021212112002 its reverse (20021121212012), we get a palindrome (41042333324014).

The spelling of 21021212112002 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred twelve thousand, two".