210030123440 has 40 divisors (see below), whose sum is σ = 489074902560. Its totient is φ = 83882180096.

The previous prime is 210030123439. The next prime is 210030123491. The reversal of 210030123440 is 44321030012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×210030123440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 1977125 + ... + 2080644.

It is an arithmetic number, because the mean of its divisors is an integer number (12226872564).

Almost surely, 2^210030123440 is an apocalyptic number.

210030123440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210030123440 is an abundant number, since it is smaller than the sum of its proper divisors (279044779120).

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

210030123440 is a wasteful number, since it uses less digits than its factorization.

210030123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058429 (or 4058423 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 210030123440 its reverse (44321030012), we get a palindrome (254351153452).

The spelling of 210030123440 in words is "two hundred ten billion, thirty million, one hundred twenty-three thousand, four hundred forty".