21111202010102 has 4 divisors (see below), whose sum is σ = 31666803015156. Its totient is φ = 10555601005050.

The previous prime is 21111202010099. The next prime is 21111202010117. The reversal of 21111202010102 is 20101020211112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21111202010102² (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 as a sum of consecutive naturals, namely, 5277800502524 + ... + 5277800502527.

It is an arithmetic number, because the mean of its divisors is an integer number (7916700753789).

Almost surely, 2^{21111202010102} is an apocalyptic number.

21111202010102 is a deficient number, since it is larger than the sum of its proper divisors (10555601005054).

21111202010102 is a wasteful number, since it uses less digits than its factorization.

21111202010102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555601005053.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111202010102 its reverse (20101020211112), we get a palindrome (41212222221214).

The spelling of 21111202010102 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, ten thousand, one hundred two".