21254725319 has 2 divisors, whose sum is σ = 21254725320. Its totient is φ = 21254725318.

The previous prime is 21254725313. The next prime is 21254725357. The reversal of 21254725319 is 91352745212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21254725319 is a prime.

It is a super-2 number, since 2×21254725319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21254725313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627362659 + 10627362660.

It is an arithmetic number, because the mean of its divisors is an integer number (10627362660).

Almost surely, 2^21254725319 is an apocalyptic number.

21254725319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254725319 is an equidigital number, since it uses as much as digits as its factorization.

21254725319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The spelling of 21254725319 in words is "twenty-one billion, two hundred fifty-four million, seven hundred twenty-five thousand, three hundred nineteen".