21554399341 has 2 divisors, whose sum is σ = 21554399342. Its totient is φ = 21554399340.

The previous prime is 21554399303. The next prime is 21554399401. The reversal of 21554399341 is 14399345512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16166105316 + 5388294025 = 127146^2 + 73405^2 .

It is a cyclic number.

It is not a de Polignac number, because 21554399341 - 2¹⁹ = 21553875053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21554399291 and 21554399300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21554394341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10777199670 + 10777199671.

It is an arithmetic number, because the mean of its divisors is an integer number (10777199671).

Almost surely, 2^21554399341 is an apocalyptic number.

It is an amenable number.

21554399341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21554399341 is an equidigital number, since it uses as much as digits as its factorization.

21554399341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 46.

The spelling of 21554399341 in words is "twenty-one billion, five hundred fifty-four million, three hundred ninety-nine thousand, three hundred forty-one".