21211001010102 has 16 divisors (see below), whose sum is σ = 42442505670960. Its totient is φ = 7066916394912.

The previous prime is 21211001010097. The next prime is 21211001010103. The reversal of 21211001010102 is 20101010011212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211001010103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854305333 + ... + 854330160.

It is an arithmetic number, because the mean of its divisors is an integer number (2652656604435).

Almost surely, 2^{21211001010102} is an apocalyptic number.

21211001010102 is an abundant number, since it is smaller than the sum of its proper divisors (21231504660858).

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

21211001010102 is a wasteful number, since it uses less digits than its factorization.

21211001010102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708637567.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211001010102 its reverse (20101010011212), we get a palindrome (41312011021314).

The spelling of 21211001010102 in words is "twenty-one trillion, two hundred eleven billion, one million, ten thousand, one hundred two".