21152554456533 has 16 divisors (see below), whose sum is σ = 29127113015040. Its totient is φ = 13646591822336.

The previous prime is 21152554456511. The next prime is 21152554456589. The reversal of 21152554456533 is 33565445525112.

It is a cyclic number.

It is not a de Polignac number, because 21152554456533 - 2¹⁰ = 21152554455509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152554456433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 842785860 + ... + 842810957.

It is an arithmetic number, because the mean of its divisors is an integer number (1820444563440).

Almost surely, 2^{21152554456533} is an apocalyptic number.

It is an amenable number.

21152554456533 is a deficient number, since it is larger than the sum of its proper divisors (7974558558507).

21152554456533 is a wasteful number, since it uses less digits than its factorization.

21152554456533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685596956.

The product of its digits is 10800000, while the sum is 51.

The spelling of 21152554456533 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifty-four million, four hundred fifty-six thousand, five hundred thirty-three".