20624381862121 has 8 divisors (see below), whose sum is σ = 20675998452744. Its totient is φ = 20572766188800.

The previous prime is 20624381862083. The next prime is 20624381862143. The reversal of 20624381862121 is 12126818342602.

It can be written as a sum of positive squares in 4 ways, for example, as 4837976211600 + 15786405650521 = 2199540^2 + 3973211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20624381862121 - 2¹¹ = 20624381860073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20624381862191) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 78656391 + ... + 78918163.

It is an arithmetic number, because the mean of its divisors is an integer number (2584499806593).

Almost surely, 2^{20624381862121} is an apocalyptic number.

It is an amenable number.

20624381862121 is a deficient number, since it is larger than the sum of its proper divisors (51616590623).

20624381862121 is a wasteful number, since it uses less digits than its factorization.

20624381862121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458651.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 20624381862121 in words is "twenty trillion, six hundred twenty-four billion, three hundred eighty-one million, eight hundred sixty-two thousand, one hundred twenty-one".