21225723127 has 12 divisors (see below), whose sum is σ = 24694215336. Its totient is φ = 18191216400.

The previous prime is 21225723097. The next prime is 21225723191. The reversal of 21225723127 is 72132752212.

It is a de Polignac number, because none of the positive numbers 2^k-21225723127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21225723092 and 21225723101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225723527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460713 + ... + 504685.

It is an arithmetic number, because the mean of its divisors is an integer number (2057851278).

Almost surely, 2^21225723127 is an apocalyptic number.

21225723127 is a deficient number, since it is larger than the sum of its proper divisors (3468492209).

21225723127 is an equidigital number, since it uses as much as digits as its factorization.

21225723127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53838 (or 53831 counting only the distinct ones).

The product of its digits is 23520, while the sum is 34.

The spelling of 21225723127 in words is "twenty-one billion, two hundred twenty-five million, seven hundred twenty-three thousand, one hundred twenty-seven".