21254110355 has 16 divisors (see below), whose sum is σ = 26230451520. Its totient is φ = 16520879232.

The previous prime is 21254110337. The next prime is 21254110387. The reversal of 21254110355 is 55301145212.

It is a cyclic number.

It is not a de Polignac number, because 21254110355 - 2⁸ = 21254110099 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, 55481 + ... + 213509.

It is an arithmetic number, because the mean of its divisors is an integer number (1639403220).

Almost surely, 2^21254110355 is an apocalyptic number.

21254110355 is a deficient number, since it is larger than the sum of its proper divisors (4976341165).

21254110355 is a wasteful number, since it uses less digits than its factorization.

21254110355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158798.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 21254110355 its reverse (55301145212), we get a palindrome (76555255567).

The spelling of 21254110355 in words is "twenty-one billion, two hundred fifty-four million, one hundred ten thousand, three hundred fifty-five".