20121751009644 has 48 divisors (see below), whose sum is σ = 50271129468000. Its totient is φ = 6241776910336.

The previous prime is 20121751009573. The next prime is 20121751009669. The reversal of 20121751009644 is 44690015712102.

It is a junction number, because it is equal to n+sod(n) for n = 20121751009596 and 20121751009605.

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 15 ways as a sum of consecutive naturals, for example, 554116869 + ... + 554153180.

It is an arithmetic number, because the mean of its divisors is an integer number (1047315197250).

Almost surely, 2^{20121751009644} is an apocalyptic number.

It is an amenable number.

20121751009644 is an abundant number, since it is smaller than the sum of its proper divisors (30149378458356).

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

20121751009644 is a wasteful number, since it uses less digits than its factorization.

20121751009644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108270162 (or 1108270160 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 20121751009644 in words is "twenty trillion, one hundred twenty-one billion, seven hundred fifty-one million, nine thousand, six hundred forty-four".