20410721853 has 4 divisors (see below), whose sum is σ = 27214295808. Its totient is φ = 13607147900.

The previous prime is 20410721789. The next prime is 20410721909. The reversal of 20410721853 is 35812701402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20410721853 - 2⁶ = 20410721789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20410721453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3401786973 + ... + 3401786978.

It is an arithmetic number, because the mean of its divisors is an integer number (6803573952).

Almost surely, 2^20410721853 is an apocalyptic number.

It is an amenable number.

20410721853 is a deficient number, since it is larger than the sum of its proper divisors (6803573955).

20410721853 is an equidigital number, since it uses as much as digits as its factorization.

20410721853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6803573954.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 20410721853 in words is "twenty billion, four hundred ten million, seven hundred twenty-one thousand, eight hundred fifty-three".