21030180609640 has 128 divisors (see below), whose sum is σ = 50736503070720. Its totient is φ = 7824719232000.

The previous prime is 21030180609631. The next prime is 21030180609649. The reversal of 21030180609640 is 4690608103012.

It is an interprime number because it is at equal distance from previous prime (21030180609631) and next prime (21030180609649).

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 = 21030180609593 and 21030180609602.

It is not an unprimeable number, because it can be changed into a prime (21030180609649) 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, 64547545 + ... + 64872535.

It is an arithmetic number, because the mean of its divisors is an integer number (396378930240).

Almost surely, 2^{21030180609640} is an apocalyptic number.

21030180609640 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 21030180609640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25368251535360).

21030180609640 is an abundant number, since it is smaller than the sum of its proper divisors (29706322461080).

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

21030180609640 is a wasteful number, since it uses less digits than its factorization.

21030180609640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326963 (or 326959 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21030180609640 in words is "twenty-one trillion, thirty billion, one hundred eighty million, six hundred nine thousand, six hundred forty".