21751401319 has 2 divisors, whose sum is σ = 21751401320. Its totient is φ = 21751401318.

The previous prime is 21751401313. The next prime is 21751401337. The reversal of 21751401319 is 91310415712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21751401319 - 2¹³ = 21751393127 is a prime.

It is a super-2 number, since 2×21751401319² (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 (21751401313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875700659 + 10875700660.

It is an arithmetic number, because the mean of its divisors is an integer number (10875700660).

Almost surely, 2^21751401319 is an apocalyptic number.

21751401319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21751401319 is an equidigital number, since it uses as much as digits as its factorization.

21751401319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 21751401319 in words is "twenty-one billion, seven hundred fifty-one million, four hundred one thousand, three hundred nineteen".