21860349472 has 192 divisors, whose sum is σ = 49112469504. Its totient is φ = 9510359040.

The previous prime is 21860349463. The next prime is 21860349499. The reversal of 21860349472 is 27494306812.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103603447 + ... + 103603657.

It is an arithmetic number, because the mean of its divisors is an integer number (255794112).

Almost surely, 2^21860349472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21860349472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24556234752).

21860349472 is an abundant number, since it is smaller than the sum of its proper divisors (27252120032).

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

21860349472 is a wasteful number, since it uses less digits than its factorization.

21860349472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 21860349472 in words is "twenty-one billion, eight hundred sixty million, three hundred forty-nine thousand, four hundred seventy-two".