21020112102 has 32 divisors (see below), whose sum is σ = 45895046400. Its totient is φ = 6365149920.

The previous prime is 21020112097. The next prime is 21020112103. The reversal of 21020112102 is 20121102012.

It is a super-2 number, since 2×21020112102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020112103) 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 15 ways as a sum of consecutive naturals, for example, 21493 + ... + 206160.

It is an arithmetic number, because the mean of its divisors is an integer number (1434220200).

Almost surely, 2^21020112102 is an apocalyptic number.

21020112102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21020112102 is an abundant number, since it is smaller than the sum of its proper divisors (24874934298).

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

21020112102 is a wasteful number, since it uses less digits than its factorization.

21020112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229068.

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

Adding to 21020112102 its reverse (20121102012), we get a palindrome (41141214114).

The spelling of 21020112102 in words is "twenty-one billion, twenty million, one hundred twelve thousand, one hundred two".