21221110010012 has 12 divisors (see below), whose sum is σ = 40513028201016. Its totient is φ = 9645959095440.

The previous prime is 21221110010003. The next prime is 21221110010033. The reversal of 21221110010012 is 21001001112212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241148977343 + ... + 241148977430.

It is an arithmetic number, because the mean of its divisors is an integer number (3376085683418).

Almost surely, 2^{21221110010012} is an apocalyptic number.

21221110010012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221110010012 is a deficient number, since it is larger than the sum of its proper divisors (19291918191004).

21221110010012 is a wasteful number, since it uses less digits than its factorization.

21221110010012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482297954788 (or 482297954786 counting only the distinct ones).

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

Adding to 21221110010012 its reverse (21001001112212), we get a palindrome (42222111122224).

The spelling of 21221110010012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, ten thousand, twelve".