21221110010102 has 4 divisors (see below), whose sum is σ = 31831665015156. Its totient is φ = 10610555005050.

The previous prime is 21221110010099. The next prime is 21221110010117. The reversal of 21221110010102 is 20101001112212.

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, 5305277502524 + ... + 5305277502527.

It is an arithmetic number, because the mean of its divisors is an integer number (7957916253789).

Almost surely, 2^{21221110010102} is an apocalyptic number.

21221110010102 is a deficient number, since it is larger than the sum of its proper divisors (10610555005054).

21221110010102 is a wasteful number, since it uses less digits than its factorization.

21221110010102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610555005053.

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

Adding to 21221110010102 its reverse (20101001112212), we get a palindrome (41322111122314).

The spelling of 21221110010102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, ten thousand, one hundred two".