21221131102104 has 32 divisors (see below), whose sum is σ = 53154656630640. Its totient is φ = 7060133184000.

The previous prime is 21221131102057. The next prime is 21221131102109. The reversal of 21221131102104 is 40120113112212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221131102109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848561197 + ... + 848586204.

Almost surely, 2^{21221131102104} is an apocalyptic number.

21221131102104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21221131102104 is an abundant number, since it is smaller than the sum of its proper divisors (31933525528536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221131102104 is a wasteful number, since it uses less digits than its factorization.

21221131102104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697147931 (or 1697147927 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21221131102104 its reverse (40120113112212), we get a palindrome (61341244214316).

The spelling of 21221131102104 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirty-one million, one hundred two thousand, one hundred four".