21054654199 has 2 divisors, whose sum is σ = 21054654200. Its totient is φ = 21054654198.

The previous prime is 21054654163. The next prime is 21054654209. The reversal of 21054654199 is 99145645012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21054654199 - 2¹³ = 21054646007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054654499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527327099 + 10527327100.

It is an arithmetic number, because the mean of its divisors is an integer number (10527327100).

Almost surely, 2^21054654199 is an apocalyptic number.

21054654199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054654199 is an equidigital number, since it uses as much as digits as its factorization.

21054654199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 21054654199 in words is "twenty-one billion, fifty-four million, six hundred fifty-four thousand, one hundred ninety-nine".