20421411503553 has 48 divisors (see below), whose sum is σ = 31418191795536. Its totient is φ = 12737377935360.

The previous prime is 20421411503533. The next prime is 20421411503557. The reversal of 20421411503553 is 35530511412402.

20421411503553 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 141 + 1 + 503 + 5 + 5 + 3 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 15294763584 + 20406116739969 = 123672^2 + 4517313^2 .

It is not a de Polignac number, because 20421411503553 - 2³⁶ = 20352692026817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20421411503557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179429401 + ... + 179543177.

It is an arithmetic number, because the mean of its divisors is an integer number (654545662407).

Almost surely, 2^{20421411503553} is an apocalyptic number.

It is an amenable number.

20421411503553 is a deficient number, since it is larger than the sum of its proper divisors (10996780291983).

20421411503553 is a wasteful number, since it uses less digits than its factorization.

20421411503553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120754 (or 120751 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 20421411503553 its reverse (35530511412402), we get a palindrome (55951922915955).

The spelling of 20421411503553 in words is "twenty trillion, four hundred twenty-one billion, four hundred eleven million, five hundred three thousand, five hundred fifty-three".