21298793780 has 24 divisors (see below), whose sum is σ = 48793600800. Its totient is φ = 7745015840.

The previous prime is 21298793743. The next prime is 21298793801. The reversal of 21298793780 is 8739789212.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 48406130 + ... + 48406569.

It is an arithmetic number, because the mean of its divisors is an integer number (2033066700).

Almost surely, 2^21298793780 is an apocalyptic number.

21298793780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21298793780 is an abundant number, since it is smaller than the sum of its proper divisors (27494807020).

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

21298793780 is a wasteful number, since it uses less digits than its factorization.

21298793780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96812719 (or 96812717 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 21298793780 in words is "twenty-one billion, two hundred ninety-eight million, seven hundred ninety-three thousand, seven hundred eighty".