21002066235 has 32 divisors (see below), whose sum is σ = 38205319680. Its totient is φ = 10940608224.

The previous prime is 21002066213. The next prime is 21002066243. The reversal of 21002066235 is 53266020012.

21002066235 is a `hidden beast` number, since 2 + 10 + 0 + 20 + 6 + 623 + 5 = 666.

It is not a de Polignac number, because 21002066235 - 2⁶ = 21002066171 is a prime.

It is a super-2 number, since 2×21002066235² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21002066199 and 21002066208.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1803159 + ... + 1814768.

It is an arithmetic number, because the mean of its divisors is an integer number (1193916240).

Almost surely, 2^21002066235 is an apocalyptic number.

21002066235 is a deficient number, since it is larger than the sum of its proper divisors (17203253445).

21002066235 is a wasteful number, since it uses less digits than its factorization.

21002066235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617984 (or 3617978 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21002066235 its reverse (53266020012), we get a palindrome (74268086247).

The spelling of 21002066235 in words is "twenty-one billion, two million, sixty-six thousand, two hundred thirty-five".