2123756544 has 352 divisors, whose sum is σ = 7131027456. Its totient is φ = 547061760.

The previous prime is 2123756527. The next prime is 2123756549. The reversal of 2123756544 is 4456573212.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123756549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19848139 + ... + 19848245.

Almost surely, 2^2123756544 is an apocalyptic number.

2123756544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2123756544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3565513728).

2123756544 is an abundant number, since it is smaller than the sum of its proper divisors (5007270912).

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

2123756544 is a wasteful number, since it uses less digits than its factorization.

2123756544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 203 counting only the distinct ones).

The product of its digits is 201600, while the sum is 39.

The square root of 2123756544 is about 46084.2331388947. The cubic root of 2123756544 is about 1285.3899796931.

The spelling of 2123756544 in words is "two billion, one hundred twenty-three million, seven hundred fifty-six thousand, five hundred forty-four".