21143775060 has 288 divisors, whose sum is σ = 70531249152. Its totient is φ = 5307586560.

The previous prime is 21143775049. The next prime is 21143775131. The reversal of 21143775060 is 6057734112.

It is a happy number.

21143775060 is a `hidden beast` number, since 2 + 1 + 143 + 7 + 7 + 506 + 0 = 666.

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

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, 5572524 + ... + 5576316.

Almost surely, 2^21143775060 is an apocalyptic number.

21143775060 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 21143775060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35265624576).

21143775060 is an abundant number, since it is smaller than the sum of its proper divisors (49387474092).

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

21143775060 is a wasteful number, since it uses less digits than its factorization.

21143775060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885 (or 3871 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 21143775060 in words is "twenty-one billion, one hundred forty-three million, seven hundred seventy-five thousand, sixty".