21154453355 has 8 divisors (see below), whose sum is σ = 29011821792. Its totient is φ = 14505910848.

The previous prime is 21154453283. The next prime is 21154453367. The reversal of 21154453355 is 55335445112.

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

It is a cyclic number.

It is not a de Polignac number, because 21154453355 - 2²⁶ = 21087344491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302206442 + ... + 302206511.

It is an arithmetic number, because the mean of its divisors is an integer number (3626477724).

Almost surely, 2^21154453355 is an apocalyptic number.

21154453355 is a deficient number, since it is larger than the sum of its proper divisors (7857368437).

21154453355 is an equidigital number, since it uses as much as digits as its factorization.

21154453355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604412965.

The product of its digits is 180000, while the sum is 38.

Adding to 21154453355 its reverse (55335445112), we get a palindrome (76489898467).

The spelling of 21154453355 in words is "twenty-one billion, one hundred fifty-four million, four hundred fifty-three thousand, three hundred fifty-five".