21154663060553 has 32 divisors (see below), whose sum is σ = 23414089910400. Its totient is φ = 18952739942400.

The previous prime is 21154663060543. The next prime is 21154663060589. The reversal of 21154663060553 is 35506036645112.

It is not a de Polignac number, because 21154663060553 - 2¹⁰ = 21154663059529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21154663060498 and 21154663060507.

It is not an unprimeable number, because it can be changed into a prime (21154663060543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1623154925 + ... + 1623167957.

It is an arithmetic number, because the mean of its divisors is an integer number (731690309700).

Almost surely, 2^{21154663060553} is an apocalyptic number.

It is an amenable number.

21154663060553 is a deficient number, since it is larger than the sum of its proper divisors (2259426849847).

21154663060553 is a wasteful number, since it uses less digits than its factorization.

21154663060553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18473.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 21154663060553 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-three million, sixty thousand, five hundred fifty-three".