21135554153645 has 8 divisors (see below), whose sum is σ = 26465389549056. Its totient is φ = 16173293613136.

The previous prime is 21135554153641. The next prime is 21135554153669. The reversal of 21135554153645 is 54635145553112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21135554153645 - 2² = 21135554153641 is a prime.

It is a super-3 number, since 3×21135554153645³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21135554153593 and 21135554153602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135554153641) 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 7 ways as a sum of consecutive naturals, for example, 91893713597 + ... + 91893713826.

It is an arithmetic number, because the mean of its divisors is an integer number (3308173693632).

Almost surely, 2^{21135554153645} is an apocalyptic number.

It is an amenable number.

21135554153645 is a deficient number, since it is larger than the sum of its proper divisors (5329835395411).

21135554153645 is a wasteful number, since it uses less digits than its factorization.

21135554153645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183787427451.

The product of its digits is 5400000, while the sum is 50.

The spelling of 21135554153645 in words is "twenty-one trillion, one hundred thirty-five billion, five hundred fifty-four million, one hundred fifty-three thousand, six hundred forty-five".