20454651326421 has 96 divisors (see below), whose sum is σ = 32304733100640. Its totient is φ = 12396964349952.

The previous prime is 20454651326357. The next prime is 20454651326423. The reversal of 20454651326421 is 12462315645402.

It is a happy number.

20454651326421 is a `hidden beast` number, since 2 + 0 + 4 + 54 + 6 + 513 + 2 + 64 + 21 = 666.

It can be written as a sum of positive squares in 16 ways, for example, as 14926091364900 + 5528559961521 = 3863430^2 + 2351289^2 .

It is not a de Polignac number, because 20454651326421 - 2⁶ = 20454651326357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454651326423) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 973417911 + ... + 973438923.

It is an arithmetic number, because the mean of its divisors is an integer number (336507636465).

Almost surely, 2^{20454651326421} is an apocalyptic number.

It is an amenable number.

20454651326421 is a deficient number, since it is larger than the sum of its proper divisors (11850081774219).

20454651326421 is a wasteful number, since it uses less digits than its factorization.

20454651326421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21655 (or 21652 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 20454651326421 in words is "twenty trillion, four hundred fifty-four billion, six hundred fifty-one million, three hundred twenty-six thousand, four hundred twenty-one".