21212101122102 has 48 divisors (see below), whose sum is σ = 50142115125648. Its totient is φ = 6427342563840.

The previous prime is 21212101121987. The next prime is 21212101122109. The reversal of 21212101122102 is 20122110121212.

It is a super-3 number, since 3×21212101122102³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212101122109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2470323 + ... + 6966110.

It is an arithmetic number, because the mean of its divisors is an integer number (1044627398451).

Almost surely, 2^{21212101122102} is an apocalyptic number.

21212101122102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212101122102 is an abundant number, since it is smaller than the sum of its proper divisors (28930014003546).

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

21212101122102 is a wasteful number, since it uses less digits than its factorization.

21212101122102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9447805 (or 9447802 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21212101122102 its reverse (20122110121212), we get a palindrome (41334211243314).

The spelling of 21212101122102 in words is "twenty-one trillion, two hundred twelve billion, one hundred one million, one hundred twenty-two thousand, one hundred two".