21621212230323 has 8 divisors (see below), whose sum is σ = 28932356198608. Its totient is φ = 14362104874464.

The previous prime is 21621212230313. The next prime is 21621212230363. The reversal of 21621212230323 is 32303221212612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21621212230323 - 2⁵ = 21621212230291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21621212230313) 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, 13009152136 + ... + 13009153797.

It is an arithmetic number, because the mean of its divisors is an integer number (3616544524826).

Almost surely, 2^{21621212230323} is an apocalyptic number.

21621212230323 is a deficient number, since it is larger than the sum of its proper divisors (7311143968285).

21621212230323 is a wasteful number, since it uses less digits than its factorization.

21621212230323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26018306213.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 21621212230323 its reverse (32303221212612), we get a palindrome (53924433442935).

The spelling of 21621212230323 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twelve million, two hundred thirty thousand, three hundred twenty-three".