21054174413 has 2 divisors, whose sum is σ = 21054174414. Its totient is φ = 21054174412.

The previous prime is 21054174389. The next prime is 21054174431. The reversal of 21054174413 is 31447145012.

Together with next prime (21054174431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11715464644 + 9338709769 = 108238^2 + 96637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21054174413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21054174413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054174313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527087206 + 10527087207.

It is an arithmetic number, because the mean of its divisors is an integer number (10527087207).

Almost surely, 2^21054174413 is an apocalyptic number.

It is an amenable number.

21054174413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054174413 is an equidigital number, since it uses as much as digits as its factorization.

21054174413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 32.

The spelling of 21054174413 in words is "twenty-one billion, fifty-four million, one hundred seventy-four thousand, four hundred thirteen".