21555135035 has 12 divisors (see below), whose sum is σ = 30089209248. Its totient is φ = 14780663856.

The previous prime is 21555135001. The next prime is 21555135053. The reversal of 21555135035 is 53053155512.

It is not a de Polignac number, because 21555135035 - 2¹⁰ = 21555134011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a junction number, because it is equal to n+sod(n) for n = 21555134986 and 21555135004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43989827 + ... + 43990316.

It is an arithmetic number, because the mean of its divisors is an integer number (2507434104).

Almost surely, 2^21555135035 is an apocalyptic number.

21555135035 is a deficient number, since it is larger than the sum of its proper divisors (8534074213).

21555135035 is an equidigital number, since it uses as much as digits as its factorization.

21555135035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87980162 (or 87980155 counting only the distinct ones).

The product of its (nonzero) digits is 56250, while the sum is 35.

The spelling of 21555135035 in words is "twenty-one billion, five hundred fifty-five million, one hundred thirty-five thousand, thirty-five".