21316554794 has 8 divisors (see below), whose sum is σ = 31976014788. Its totient is φ = 10657883200.

The previous prime is 21316554773. The next prime is 21316554797. The reversal of 21316554794 is 49745561312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21049657225 + 266897569 = 145085^2 + 16337^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21316554797) 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, 124097 + ... + 240900.

Almost surely, 2^21316554794 is an apocalyptic number.

21316554794 is a deficient number, since it is larger than the sum of its proper divisors (10659459994).

21316554794 is a wasteful number, since it uses less digits than its factorization.

21316554794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394200.

The product of its digits is 907200, while the sum is 47.

The spelling of 21316554794 in words is "twenty-one billion, three hundred sixteen million, five hundred fifty-four thousand, seven hundred ninety-four".