2123161440 has 48 divisors (see below), whose sum is σ = 6687960048. Its totient is φ = 566176256.

The previous prime is 2123161429. The next prime is 2123161451. The reversal of 2123161440 is 441613212.

It is an interprime number because it is at equal distance from previous prime (2123161429) and next prime (2123161451).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2123161440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211147 + ... + 2212106.

It is an arithmetic number, because the mean of its divisors is an integer number (139332501).

Almost surely, 2^2123161440 is an apocalyptic number.

2123161440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123161440 is an abundant number, since it is smaller than the sum of its proper divisors (4564798608).

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

2123161440 is a wasteful number, since it uses less digits than its factorization.

2123161440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423271 (or 4423263 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2123161440 is about 46077.7759879966. The cubic root of 2123161440 is about 1285.2699075219.

Adding to 2123161440 its reverse (441613212), we get a palindrome (2564774652).

The spelling of 2123161440 in words is "two billion, one hundred twenty-three million, one hundred sixty-one thousand, four hundred forty".