21202120101002 has 4 divisors (see below), whose sum is σ = 31803180151506. Its totient is φ = 10601060050500.

The previous prime is 21202120100989. The next prime is 21202120101017. The reversal of 21202120101002 is 20010102120212.

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., 11695572374641 + 9506547726361 = 3419879^2 + 3083269^2 .

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, 5300530025249 + ... + 5300530025252.

Almost surely, 2^{21202120101002} is an apocalyptic number.

21202120101002 is a deficient number, since it is larger than the sum of its proper divisors (10601060050504).

21202120101002 is a wasteful number, since it uses less digits than its factorization.

21202120101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601060050503.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21202120101002 its reverse (20010102120212), we get a palindrome (41212222221214).

The spelling of 21202120101002 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, one hundred one thousand, two".