21146555054553 has 24 divisors (see below), whose sum is σ = 29958094516320. Its totient is φ = 13265515115520.

The previous prime is 21146555054531. The next prime is 21146555054563. The reversal of 21146555054553 is 35545055564112.

It is not a de Polignac number, because 21146555054553 - 2⁹ = 21146555054041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 21146555054496 and 21146555054505.

It is not an unprimeable number, because it can be changed into a prime (21146555054563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1280578 + ... + 6628196.

It is an arithmetic number, because the mean of its divisors is an integer number (1248253938180).

Almost surely, 2^{21146555054553} is an apocalyptic number.

It is an amenable number.

21146555054553 is a deficient number, since it is larger than the sum of its proper divisors (8811539461767).

21146555054553 is a wasteful number, since it uses less digits than its factorization.

21146555054553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352217 (or 5352200 counting only the distinct ones).

The product of its (nonzero) digits is 9000000, while the sum is 51.

The spelling of 21146555054553 in words is "twenty-one trillion, one hundred forty-six billion, five hundred fifty-five million, fifty-four thousand, five hundred fifty-three".