20091421681625 has 32 divisors (see below), whose sum is σ = 29141804540160. Its totient is φ = 13543466784000.

The previous prime is 20091421681609. The next prime is 20091421681631. The reversal of 20091421681625 is 52618612419002.

It is not a de Polignac number, because 20091421681625 - 2⁴ = 20091421681609 is a prime.

It is a super-2 number, since 2×20091421681625² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20091421681625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194538416 + ... + 194641665.

It is an arithmetic number, because the mean of its divisors is an integer number (910681391880).

Almost surely, 2^{20091421681625} is an apocalyptic number.

20091421681625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20091421681625 is a deficient number, since it is larger than the sum of its proper divisors (9050382858535).

20091421681625 is an equidigital number, since it uses as much as digits as its factorization.

20091421681625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389180162 (or 389180152 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 20091421681625 in words is "twenty trillion, ninety-one billion, four hundred twenty-one million, six hundred eighty-one thousand, six hundred twenty-five".