21621212230324 has 48 divisors (see below), whose sum is σ = 44298108489600. Its totient is φ = 9040025917440.

The previous prime is 21621212230313. The next prime is 21621212230363. The reversal of 21621212230324 is 42303221212612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58189459 + ... + 58559845.

It is an arithmetic number, because the mean of its divisors is an integer number (922877260200).

Almost surely, 2^{21621212230324} is an apocalyptic number.

It is an amenable number.

21621212230324 is an abundant number, since it is smaller than the sum of its proper divisors (22676896259276).

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

21621212230324 is a wasteful number, since it uses less digits than its factorization.

21621212230324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421288 (or 421286 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21621212230324 its reverse (42303221212612), we get a palindrome (63924433442936).

The spelling of 21621212230324 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twelve million, two hundred thirty thousand, three hundred twenty-four".