21054999611 has 2 divisors, whose sum is σ = 21054999612. Its totient is φ = 21054999610.

The previous prime is 21054999593. The next prime is 21054999767. The reversal of 21054999611 is 11699945012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21054999611 - 2¹⁸ = 21054737467 is a prime.

It is a super-4 number, since 4×21054999611⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21054999211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527499805 + 10527499806.

It is an arithmetic number, because the mean of its divisors is an integer number (10527499806).

Almost surely, 2^21054999611 is an apocalyptic number.

21054999611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054999611 is an equidigital number, since it uses as much as digits as its factorization.

21054999611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 21054999611 in words is "twenty-one billion, fifty-four million, nine hundred ninety-nine thousand, six hundred eleven".