21860858880 has 1408 divisors, whose sum is σ = 99042048000. Its totient is φ = 4459069440.

The previous prime is 21860858867. The next prime is 21860858893. The reversal of 21860858880 is 8885806812.

It is a happy number.

21860858880 is a `hidden beast` number, since 21 + 8 + 608 + 5 + 8 + 8 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21860858867) and next prime (21860858893).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 533191660 + ... + 533191700.

Almost surely, 2^21860858880 is an apocalyptic number.

21860858880 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 21860858880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49521024000).

21860858880 is an abundant number, since it is smaller than the sum of its proper divisors (77181189120).

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

21860858880 is a wasteful number, since it uses less digits than its factorization.

21860858880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 1966080, while the sum is 54.

The spelling of 21860858880 in words is "twenty-one billion, eight hundred sixty million, eight hundred fifty-eight thousand, eight hundred eighty".