21155385335 has 16 divisors (see below), whose sum is σ = 29949007872. Its totient is φ = 14038596000.

The previous prime is 21155385301. The next prime is 21155385353. The reversal of 21155385335 is 53358355112.

It is not a de Polignac number, because 21155385335 - 2¹⁰ = 21155384311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21155385292 and 21155385301.

It is a congruent number.

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, 9747941 + ... + 9750110.

It is an arithmetic number, because the mean of its divisors is an integer number (1871812992).

Almost surely, 2^21155385335 is an apocalyptic number.

21155385335 is a deficient number, since it is larger than the sum of its proper divisors (8793622537).

21155385335 is a wasteful number, since it uses less digits than its factorization.

21155385335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19498094.

The product of its digits is 270000, while the sum is 41.

The spelling of 21155385335 in words is "twenty-one billion, one hundred fifty-five million, three hundred eighty-five thousand, three hundred thirty-five".