21212201112102 has 256 divisors, whose sum is σ = 67013456025600. Its totient is φ = 4786675015680.

The previous prime is 21212201112061. The next prime is 21212201112143. The reversal of 21212201112102 is 20121110221212.

21212201112102 is a `hidden beast` number, since 2 + 121 + 220 + 111 + 210 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21212201112061) and next prime (21212201112143).

It is a super-2 number, since 2×21212201112102² (a number of 27 digits) contains 22 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 an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10623027 + ... + 12460862.

It is an arithmetic number, because the mean of its divisors is an integer number (261771312600).

Almost surely, 2^{21212201112102} is an apocalyptic number.

21212201112102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21212201112102 is an abundant number, since it is smaller than the sum of its proper divisors (45801254913498).

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

21212201112102 is a wasteful number, since it uses less digits than its factorization.

21212201112102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23083948 (or 23083942 counting only the distinct ones).

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

Adding to 21212201112102 its reverse (20121110221212), we get a palindrome (41333311333314).

The spelling of 21212201112102 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, one hundred twelve thousand, one hundred two".