21555753293 has 8 divisors (see below), whose sum is σ = 21851100768. Its totient is φ = 21261254544.

The previous prime is 21555753269. The next prime is 21555753301. The reversal of 21555753293 is 39235755512.

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

It is a cyclic number.

It is not a de Polignac number, because 21555753293 - 2⁶ = 21555753229 is a prime.

It is a super-4 number, since 4×21555753293⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21555753493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160955 + ... + 262712.

It is an arithmetic number, because the mean of its divisors is an integer number (2731387596).

Almost surely, 2^21555753293 is an apocalyptic number.

It is an amenable number.

21555753293 is a deficient number, since it is larger than the sum of its proper divisors (295347475).

21555753293 is an equidigital number, since it uses as much as digits as its factorization.

21555753293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424363.

The product of its digits is 1417500, while the sum is 47.

The spelling of 21555753293 in words is "twenty-one billion, five hundred fifty-five million, seven hundred fifty-three thousand, two hundred ninety-three".