21907746255 has 16 divisors (see below), whose sum is σ = 35057038464. Its totient is φ = 11682583200.

The previous prime is 21907746251. The next prime is 21907746271. The reversal of 21907746255 is 55264770912.

It is not a de Polignac number, because 21907746255 - 2² = 21907746251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21907746251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25180 + ... + 210830.

It is an arithmetic number, because the mean of its divisors is an integer number (2191064904).

Almost surely, 2^21907746255 is an apocalyptic number.

21907746255 is a deficient number, since it is larger than the sum of its proper divisors (13149292209).

21907746255 is a wasteful number, since it uses less digits than its factorization.

21907746255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193526.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 21907746255 in words is "twenty-one billion, nine hundred seven million, seven hundred forty-six thousand, two hundred fifty-five".