21221212130104 has 64 divisors (see below), whose sum is σ = 45590722683840. Its totient is φ = 9071469158400.

The previous prime is 21221212130101. The next prime is 21221212130141. The reversal of 21221212130104 is 40103121212212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221212130101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432769972 + ... + 432819004.

It is an arithmetic number, because the mean of its divisors is an integer number (712355041935).

Almost surely, 2^{21221212130104} is an apocalyptic number.

It is an amenable number.

21221212130104 is an abundant number, since it is smaller than the sum of its proper divisors (24369510553736).

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

21221212130104 is a wasteful number, since it uses less digits than its factorization.

21221212130104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68720 (or 68716 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21221212130104 its reverse (40103121212212), we get a palindrome (61324333342316).

The spelling of 21221212130104 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thirty thousand, one hundred four".