21554113519 has 2 divisors, whose sum is σ = 21554113520. Its totient is φ = 21554113518.

The previous prime is 21554113507. The next prime is 21554113541. The reversal of 21554113519 is 91531145512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21554113519 - 2¹¹ = 21554111471 is a prime.

It is a super-2 number, since 2×21554113519² (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 (21554113219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10777056759 + 10777056760.

It is an arithmetic number, because the mean of its divisors is an integer number (10777056760).

Almost surely, 2^21554113519 is an apocalyptic number.

21554113519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21554113519 is an equidigital number, since it uses as much as digits as its factorization.

21554113519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 37.

The spelling of 21554113519 in words is "twenty-one billion, five hundred fifty-four million, one hundred thirteen thousand, five hundred nineteen".