21450165794 has 8 divisors (see below), whose sum is σ = 32582530560. Its totient is φ = 10589322276.

The previous prime is 21450165791. The next prime is 21450165797. The reversal of 21450165794 is 49756105412.

It is an interprime number because it is at equal distance from previous prime (21450165791) and next prime (21450165797).

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

It is a super-2 number, since 2×21450165794² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21450165791) 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, 67880114 + ... + 67880429.

It is an arithmetic number, because the mean of its divisors is an integer number (4072816320).

Almost surely, 2^21450165794 is an apocalyptic number.

21450165794 is a deficient number, since it is larger than the sum of its proper divisors (11132364766).

21450165794 is a wasteful number, since it uses less digits than its factorization.

21450165794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135760624.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 21450165794 in words is "twenty-one billion, four hundred fifty million, one hundred sixty-five thousand, seven hundred ninety-four".