21221230104 has 48 divisors (see below), whose sum is σ = 58558593600. Its totient is φ = 6940275264.

The previous prime is 21221230099. The next prime is 21221230109. The reversal of 21221230104 is 40103212212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21221230099) and next prime (21221230109).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221230109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2776744 + ... + 2784375.

It is an arithmetic number, because the mean of its divisors is an integer number (1219970700).

Almost surely, 2^21221230104 is an apocalyptic number.

21221230104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21221230104 is an abundant number, since it is smaller than the sum of its proper divisors (37337363496).

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

21221230104 is a wasteful number, since it uses less digits than its factorization.

21221230104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561184 (or 5561177 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21221230104 its reverse (40103212212), we get a palindrome (61324442316).

The spelling of 21221230104 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty thousand, one hundred four".