21135533454 has 48 divisors (see below), whose sum is σ = 52344639360. Its totient is φ = 6037681680.

The previous prime is 21135533453. The next prime is 21135533459. The reversal of 21135533454 is 45433553112.

21135533454 is a `hidden beast` number, since 2 + 113 + 5 + 533 + 4 + 5 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135533453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 998917 + ... + 1019855.

It is an arithmetic number, because the mean of its divisors is an integer number (1090513320).

Almost surely, 2^21135533454 is an apocalyptic number.

21135533454 is an abundant number, since it is smaller than the sum of its proper divisors (31209105906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21135533454 is a wasteful number, since it uses less digits than its factorization.

21135533454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28965 (or 28962 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The spelling of 21135533454 in words is "twenty-one billion, one hundred thirty-five million, five hundred thirty-three thousand, four hundred fifty-four".