2123454555040 has 192 divisors, whose sum is σ = 6176648991744. Its totient is φ = 671788412928.

The previous prime is 2123454555037. The next prime is 2123454555043. The reversal of 2123454555040 is 405554543212.

It is an interprime number because it is at equal distance from previous prime (2123454555037) and next prime (2123454555043).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2123454554984 and 2123454555002.

It is not an unprimeable number, because it can be changed into a prime (2123454555043) 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, 41281017 + ... + 41332423.

It is an arithmetic number, because the mean of its divisors is an integer number (32170046832).

Almost surely, 2^{2123454555040} is an apocalyptic number.

2123454555040 is a gapful number since it is divisible by the number (20) 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 2123454555040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3088324495872).

2123454555040 is an abundant number, since it is smaller than the sum of its proper divisors (4053194436704).

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

2123454555040 is a wasteful number, since it uses less digits than its factorization.

2123454555040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54279 (or 54271 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 40.

The spelling of 2123454555040 in words is "two trillion, one hundred twenty-three billion, four hundred fifty-four million, five hundred fifty-five thousand, forty".