21020112221102 has 4 divisors (see below), whose sum is σ = 31530168331656. Its totient is φ = 10510056110550.

The previous prime is 21020112221083. The next prime is 21020112221113. The reversal of 21020112221102 is 20112221102012.

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

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, 5255028055274 + ... + 5255028055277.

It is an arithmetic number, because the mean of its divisors is an integer number (7882542082914).

Almost surely, 2^{21020112221102} is an apocalyptic number.

21020112221102 is a deficient number, since it is larger than the sum of its proper divisors (10510056110554).

21020112221102 is a wasteful number, since it uses less digits than its factorization.

21020112221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510056110553.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21020112221102 its reverse (20112221102012), we get a palindrome (41132333323114).

The spelling of 21020112221102 in words is "twenty-one trillion, twenty billion, one hundred twelve million, two hundred twenty-one thousand, one hundred two".