21154414354 has 8 divisors (see below), whose sum is σ = 32166301500. Its totient is φ = 10432313856.

The previous prime is 21154414331. The next prime is 21154414397. The reversal of 21154414354 is 45341445112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18597595129 + 2556819225 = 136373^2 + 50565^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72446479 + ... + 72446770.

Almost surely, 2^21154414354 is an apocalyptic number.

21154414354 is a deficient number, since it is larger than the sum of its proper divisors (11011887146).

21154414354 is a wasteful number, since it uses less digits than its factorization.

21154414354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144893324.

The product of its digits is 38400, while the sum is 34.

Adding to 21154414354 its reverse (45341445112), we get a palindrome (66495859466).

The spelling of 21154414354 in words is "twenty-one billion, one hundred fifty-four million, four hundred fourteen thousand, three hundred fifty-four".