2123015400 has 384 divisors, whose sum is σ = 8078054400. Its totient is φ = 508204800.

The previous prime is 2123015351. The next prime is 2123015449. The reversal of 2123015400 is 45103212.

2123015400 is a `hidden beast` number, since 2 + 123 + 0 + 1 + 540 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (2123015351) and next prime (2123015449).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6118027 + ... + 6118373.

It is an arithmetic number, because the mean of its divisors is an integer number (21036600).

Almost surely, 2^2123015400 is an apocalyptic number.

2123015400 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 2123015400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4039027200).

2123015400 is an abundant number, since it is smaller than the sum of its proper divisors (5955039000).

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

2123015400 is a wasteful number, since it uses less digits than its factorization.

2123015400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2123015400 is about 46076.1912488435. The cubic root of 2123015400 is about 1285.2404380842.

Adding to 2123015400 its reverse (45103212), we get a palindrome (2168118612).

The spelling of 2123015400 in words is "two billion, one hundred twenty-three million, fifteen thousand, four hundred".