21111210210102 has 16 divisors (see below), whose sum is σ = 42222469739520. Its totient is φ = 7037061850152.

The previous prime is 21111210210091. The next prime is 21111210210119. The reversal of 21111210210102 is 20101201211112.

It is a happy number.

It is a super-2 number, since 2×21111210210102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5847099 + ... + 8741337.

It is an arithmetic number, because the mean of its divisors is an integer number (2638904358720).

Almost surely, 2^{21111210210102} is an apocalyptic number.

21111210210102 is an abundant number, since it is smaller than the sum of its proper divisors (21111259529418).

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

21111210210102 is a wasteful number, since it uses less digits than its factorization.

21111210210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109947.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111210210102 its reverse (20101201211112), we get a palindrome (41212411421214).

The spelling of 21111210210102 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, two hundred ten thousand, one hundred two".