21651224023560 has 128 divisors (see below), whose sum is σ = 66118483526400. Its totient is φ = 5670980198400.

The previous prime is 21651224023531. The next prime is 21651224023607. The reversal of 21651224023560 is 6532042215612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5100129 + ... + 8325488.

It is an arithmetic number, because the mean of its divisors is an integer number (516550652550).

Almost surely, 2^{21651224023560} is an apocalyptic number.

21651224023560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21651224023560 is an abundant number, since it is smaller than the sum of its proper divisors (44467259502840).

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

21651224023560 is a wasteful number, since it uses less digits than its factorization.

21651224023560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13425871 (or 13425867 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 21651224023560 in words is "twenty-one trillion, six hundred fifty-one billion, two hundred twenty-four million, twenty-three thousand, five hundred sixty".