21555753294 has 8 divisors (see below), whose sum is σ = 43111506600. Its totient is φ = 7185251096.

The previous prime is 21555753269. The next prime is 21555753301. The reversal of 21555753294 is 49235755512.

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

21555753294 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796312769 + ... + 1796312780.

It is an arithmetic number, because the mean of its divisors is an integer number (5388938325).

Almost surely, 2^21555753294 is an apocalyptic number.

21555753294 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21555753294 is a wasteful number, since it uses less digits than its factorization.

21555753294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592625554.

The product of its digits is 1890000, while the sum is 48.

The spelling of 21555753294 in words is "twenty-one billion, five hundred fifty-five million, seven hundred fifty-three thousand, two hundred ninety-four".