21196262880 has 288 divisors, whose sum is σ = 78659695296. Its totient is φ = 5166415872.

The previous prime is 21196262849. The next prime is 21196262891. The reversal of 21196262880 is 8826269112.

21196262880 is a `hidden beast` number, since 2 + 1 + 19 + 6 + 2 + 628 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1922664 + ... + 1933656.

It is an arithmetic number, because the mean of its divisors is an integer number (273123942).

Almost surely, 2^21196262880 is an apocalyptic number.

21196262880 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 21196262880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39329847648).

21196262880 is an abundant number, since it is smaller than the sum of its proper divisors (57463432416).

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

21196262880 is a wasteful number, since it uses less digits than its factorization.

21196262880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130 (or 11119 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 21196262880 in words is "twenty-one billion, one hundred ninety-six million, two hundred sixty-two thousand, eight hundred eighty".