21323120238 has 56 divisors (see below), whose sum is σ = 54805835568. Its totient is φ = 6092317152.

The previous prime is 21323120237. The next prime is 21323120257. The reversal of 21323120238 is 83202132312.

It is a happy number.

It is a super-3 number, since 3×21323120238³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323120237) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1034431 + ... + 1054842.

Almost surely, 2^21323120238 is an apocalyptic number.

21323120238 is an abundant number, since it is smaller than the sum of its proper divisors (33482715330).

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

21323120238 is an equidigital number, since it uses as much as digits as its factorization.

21323120238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089300 (or 2089285 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 21323120238 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, two hundred thirty-eight".