21021001102 has 8 divisors (see below), whose sum is σ = 31532315112. Its totient is φ = 10510229400.

The previous prime is 21021001097. The next prime is 21021001123. The reversal of 21021001102 is 20110012012.

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

It is a congruent number.

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, 18424 + ... + 205867.

It is an arithmetic number, because the mean of its divisors is an integer number (3941539389).

Almost surely, 2^21021001102 is an apocalyptic number.

21021001102 is a deficient number, since it is larger than the sum of its proper divisors (10511314010).

21021001102 is a wasteful number, since it uses less digits than its factorization.

21021001102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271154.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21021001102 its reverse (20110012012), we get a palindrome (41131013114).

The spelling of 21021001102 in words is "twenty-one billion, twenty-one million, one thousand, one hundred two".