21002101202 has 4 divisors (see below), whose sum is σ = 31503151806. Its totient is φ = 10501050600.

The previous prime is 21002101181. The next prime is 21002101249. The reversal of 21002101202 is 20210120012.

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., 16822349401 + 4179751801 = 129701^2 + 64651^2 .

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, 5250525299 + ... + 5250525302.

Almost surely, 2^21002101202 is an apocalyptic number.

21002101202 is a deficient number, since it is larger than the sum of its proper divisors (10501050604).

21002101202 is a wasteful number, since it uses less digits than its factorization.

21002101202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501050603.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002101202 its reverse (20210120012), we get a palindrome (41212221214).

The spelling of 21002101202 in words is "twenty-one billion, two million, one hundred one thousand, two hundred two".