21043077120 has 336 divisors, whose sum is σ = 78573916512. Its totient is φ = 5178654720.

The previous prime is 21043077119. The next prime is 21043077137. The reversal of 21043077120 is 2177034012.

It is a happy number.

21043077120 is a `hidden beast` number, since 210 + 430 + 7 + 7 + 12 + 0 = 666.

It is a super-2 number, since 2×21043077120² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4790125 + ... + 4794515.

It is an arithmetic number, because the mean of its divisors is an integer number (233850942).

Almost surely, 2^21043077120 is an apocalyptic number.

21043077120 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 21043077120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39286958256).

21043077120 is an abundant number, since it is smaller than the sum of its proper divisors (57530839392).

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

21043077120 is a wasteful number, since it uses less digits than its factorization.

21043077120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4414 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The spelling of 21043077120 in words is "twenty-one billion, forty-three million, seventy-seven thousand, one hundred twenty".