21154414355 has 16 divisors (see below), whose sum is σ = 26922896640. Its totient is φ = 15901750272.

The previous prime is 21154414331. The next prime is 21154414397. The reversal of 21154414355 is 55341445112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21154414355 - 2¹⁰ = 21154413331 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153410 + ... + 256599.

It is an arithmetic number, because the mean of its divisors is an integer number (1682681040).

Almost surely, 2^21154414355 is an apocalyptic number.

21154414355 is a deficient number, since it is larger than the sum of its proper divisors (5768482285).

21154414355 is a wasteful number, since it uses less digits than its factorization.

21154414355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410638.

The product of its digits is 48000, while the sum is 35.

Adding to 21154414355 its reverse (55341445112), we get a palindrome (76495859467).

The spelling of 21154414355 in words is "twenty-one billion, one hundred fifty-four million, four hundred fourteen thousand, three hundred fifty-five".