21001021202 has 8 divisors (see below), whose sum is σ = 36001750656. Its totient is φ = 9000437652.

The previous prime is 21001021187. The next prime is 21001021219. The reversal of 21001021202 is 20212010012.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750036458 + ... + 750036485.

It is an arithmetic number, because the mean of its divisors is an integer number (4500218832).

Almost surely, 2^21001021202 is an apocalyptic number.

21001021202 is a deficient number, since it is larger than the sum of its proper divisors (15000729454).

21001021202 is a wasteful number, since it uses less digits than its factorization.

21001021202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500072952.

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

Adding to 21001021202 its reverse (20212010012), we get a palindrome (41213031214).

The spelling of 21001021202 in words is "twenty-one billion, one million, twenty-one thousand, two hundred two".