21060183780 has 144 divisors (see below), whose sum is σ = 67940570880. Its totient is φ = 5262234624.

The previous prime is 21060183769. The next prime is 21060183803. The reversal of 21060183780 is 8738106012.

21060183780 is a `hidden beast` number, since 2 + 10 + 601 + 8 + 37 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 679461 + ... + 709779.

It is an arithmetic number, because the mean of its divisors is an integer number (471809520).

Almost surely, 2^21060183780 is an apocalyptic number.

21060183780 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 21060183780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33970285440).

21060183780 is an abundant number, since it is smaller than the sum of its proper divisors (46880387100).

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

21060183780 is a wasteful number, since it uses less digits than its factorization.

21060183780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30578 (or 30573 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

Adding to 21060183780 its reverse (8738106012), we get a palindrome (29798289792).

The spelling of 21060183780 in words is "twenty-one billion, sixty million, one hundred eighty-three thousand, seven hundred eighty".