21387155335 has 96 divisors (see below), whose sum is σ = 33668369280. Its totient is φ = 12747571200.

The previous prime is 21387155323. The next prime is 21387155359. The reversal of 21387155335 is 53355178312.

It is not a de Polignac number, because 21387155335 - 2¹⁹ = 21386631047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21387155291 and 21387155300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7031415 + ... + 7034455.

It is an arithmetic number, because the mean of its divisors is an integer number (350712180).

Almost surely, 2^21387155335 is an apocalyptic number.

21387155335 is a deficient number, since it is larger than the sum of its proper divisors (12281213945).

21387155335 is a wasteful number, since it uses less digits than its factorization.

21387155335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3149 (or 3136 counting only the distinct ones).

The product of its digits is 378000, while the sum is 43.

The spelling of 21387155335 in words is "twenty-one billion, three hundred eighty-seven million, one hundred fifty-five thousand, three hundred thirty-five".