21101221210102 has 32 divisors (see below), whose sum is σ = 35099205435648. Its totient is φ = 9433183860000.

The previous prime is 21101221210099. The next prime is 21101221210217. The reversal of 21101221210102 is 20101212210112.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11335327 + ... + 13064917.

It is an arithmetic number, because the mean of its divisors is an integer number (1096850169864).

Almost surely, 2^{21101221210102} is an apocalyptic number.

21101221210102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21101221210102 is a deficient number, since it is larger than the sum of its proper divisors (13997984225546).

21101221210102 is a wasteful number, since it uses less digits than its factorization.

21101221210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738756.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21101221210102 its reverse (20101212210112), we get a palindrome (41202433420214).

The spelling of 21101221210102 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, two hundred ten thousand, one hundred two".