23121343440 has 120 divisors (see below), whose sum is σ = 83622225960. Its totient is φ = 5691405312.

The previous prime is 23121343429. The next prime is 23121343457. The reversal of 23121343440 is 4434312132.

23121343440 is a `hidden beast` number, since 2 + 3 + 1 + 213 + 4 + 3 + 440 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4792515984 + 18328827456 = 69228^2 + 135384^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1225755 + ... + 1244474.

It is an arithmetic number, because the mean of its divisors is an integer number (696851883).

Almost surely, 2^23121343440 is an apocalyptic number.

23121343440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121343440 is an abundant number, since it is smaller than the sum of its proper divisors (60500882520).

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

23121343440 is a wasteful number, since it uses less digits than its factorization.

23121343440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470261 (or 2470252 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 23121343440 its reverse (4434312132), we get a palindrome (27555655572).

The spelling of 23121343440 in words is "twenty-three billion, one hundred twenty-one million, three hundred forty-three thousand, four hundred forty".