21101210210102 has 64 divisors (see below), whose sum is σ = 36391946457600. Its totient is φ = 9075311642880.

The previous prime is 21101210210063. The next prime is 21101210210107. The reversal of 21101210210102 is 20101201210112.

It is a super-2 number, since 2×21101210210102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101210210107) 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 31 ways as a sum of consecutive naturals, for example, 1301170298 + ... + 1301186514.

It is an arithmetic number, because the mean of its divisors is an integer number (568624163400).

Almost surely, 2^{21101210210102} is an apocalyptic number.

21101210210102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21101210210102 is a deficient number, since it is larger than the sum of its proper divisors (15290736247498).

21101210210102 is a wasteful number, since it uses less digits than its factorization.

21101210210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19941.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21101210210102 its reverse (20101201210112), we get a palindrome (41202411420214).

It can be divided in two parts, 21101210 and 210102, that added together give a palindrome (21311312).

The spelling of 21101210210102 in words is "twenty-one trillion, one hundred one billion, two hundred ten million, two hundred ten thousand, one hundred two".