21154414353 has 16 divisors (see below), whose sum is σ = 29171490816. Its totient is φ = 13621882320.

The previous prime is 21154414331. The next prime is 21154414397. The reversal of 21154414353 is 35341445112.

It is not a de Polignac number, because 21154414353 - 2¹⁸ = 21154152209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21154418353) 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, 168825 + ... + 266102.

It is an arithmetic number, because the mean of its divisors is an integer number (1823218176).

Almost surely, 2^21154414353 is an apocalyptic number.

It is an amenable number.

21154414353 is a deficient number, since it is larger than the sum of its proper divisors (8017076463).

21154414353 is a wasteful number, since it uses less digits than its factorization.

21154414353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435484.

The product of its digits is 28800, while the sum is 33.

Adding to 21154414353 its reverse (35341445112), we get a palindrome (56495859465).

The spelling of 21154414353 in words is "twenty-one billion, one hundred fifty-four million, four hundred fourteen thousand, three hundred fifty-three".