21101020235 has 16 divisors (see below), whose sum is σ = 25613884800. Its totient is φ = 16685830656.

The previous prime is 21101020229. The next prime is 21101020261. The reversal of 21101020235 is 53202010112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101020235 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, 1978046 + ... + 1988684.

It is an arithmetic number, because the mean of its divisors is an integer number (1600867800).

Almost surely, 2^21101020235 is an apocalyptic number.

21101020235 is a deficient number, since it is larger than the sum of its proper divisors (4512864565).

21101020235 is a wasteful number, since it uses less digits than its factorization.

21101020235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15190.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21101020235 its reverse (53202010112), we get a palindrome (74303030347).

The spelling of 21101020235 in words is "twenty-one billion, one hundred one million, twenty thousand, two hundred thirty-five".