21211221110102 has 4 divisors (see below), whose sum is σ = 31816831665156. Its totient is φ = 10605610555050.

The previous prime is 21211221110071. The next prime is 21211221110119. The reversal of 21211221110102 is 20101112211212.

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, 5302805277524 + ... + 5302805277527.

It is an arithmetic number, because the mean of its divisors is an integer number (7954207916289).

Almost surely, 2^{21211221110102} is an apocalyptic number.

21211221110102 is a deficient number, since it is larger than the sum of its proper divisors (10605610555054).

21211221110102 is a wasteful number, since it uses less digits than its factorization.

21211221110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605610555053.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211221110102 its reverse (20101112211212), we get a palindrome (41312333321314).

The spelling of 21211221110102 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred ten thousand, one hundred two".