21040156735 has 8 divisors (see below), whose sum is σ = 27190356480. Its totient is φ = 15537346464.

The previous prime is 21040156733. The next prime is 21040156747. The reversal of 21040156735 is 53765104012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21040156735 - 2¹ = 21040156733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21040156735.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040156733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161847295 + ... + 161847424.

It is an arithmetic number, because the mean of its divisors is an integer number (3398794560).

Almost surely, 2^21040156735 is an apocalyptic number.

21040156735 is a deficient number, since it is larger than the sum of its proper divisors (6150199745).

21040156735 is a wasteful number, since it uses less digits than its factorization.

21040156735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323694737.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 21040156735 in words is "twenty-one billion, forty million, one hundred fifty-six thousand, seven hundred thirty-five".