21021120102 has 16 divisors (see below), whose sum is σ = 42458501232. Its totient is φ = 6937663200.

The previous prime is 21021120083. The next prime is 21021120103. The reversal of 21021120102 is 20102112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021120103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17343553 + ... + 17344764.

It is an arithmetic number, because the mean of its divisors is an integer number (2653656327).

Almost surely, 2^21021120102 is an apocalyptic number.

21021120102 is an abundant number, since it is smaller than the sum of its proper divisors (21437381130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021120102 is a wasteful number, since it uses less digits than its factorization.

21021120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34688423.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021120102 its reverse (20102112012), we get a palindrome (41123232114).

It can be divided in two parts, 2102112010 and 2, that added together give a palindrome (2102112012).

The spelling of 21021120102 in words is "twenty-one billion, twenty-one million, one hundred twenty thousand, one hundred two".