21745299053 has 4 divisors (see below), whose sum is σ = 21889307808. Its totient is φ = 21601290300.

The previous prime is 21745299049. The next prime is 21745299061. The reversal of 21745299053 is 35099254712.

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 21745299053 - 2² = 21745299049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21745298989 and 21745299007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745299253) 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, 72004151 + ... + 72004452.

It is an arithmetic number, because the mean of its divisors is an integer number (5472326952).

Almost surely, 2^21745299053 is an apocalyptic number.

It is an amenable number.

21745299053 is a deficient number, since it is larger than the sum of its proper divisors (144008755).

21745299053 is a wasteful number, since it uses less digits than its factorization.

21745299053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144008754.

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 21745299053 in words is "twenty-one billion, seven hundred forty-five million, two hundred ninety-nine thousand, fifty-three".