21492260580 has 192 divisors, whose sum is σ = 70416138240. Its totient is φ = 4795846656.

The previous prime is 21492260563. The next prime is 21492260593. The reversal of 21492260580 is 8506229412.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9454324 + ... + 9456596.

It is an arithmetic number, because the mean of its divisors is an integer number (366750720).

Almost surely, 2^21492260580 is an apocalyptic number.

21492260580 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 21492260580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35208069120).

21492260580 is an abundant number, since it is smaller than the sum of its proper divisors (48923877660).

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

21492260580 is a wasteful number, since it uses less digits than its factorization.

21492260580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818 (or 2816 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

Adding to 21492260580 its reverse (8506229412), we get a palindrome (29998489992).

The spelling of 21492260580 in words is "twenty-one billion, four hundred ninety-two million, two hundred sixty thousand, five hundred eighty".