21100544051 has 2 divisors, whose sum is σ = 21100544052. Its totient is φ = 21100544050.

The previous prime is 21100544033. The next prime is 21100544063. The reversal of 21100544051 is 15044500112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100544051 - 2⁶ = 21100543987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100544251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550272025 + 10550272026.

It is an arithmetic number, because the mean of its divisors is an integer number (10550272026).

Almost surely, 2^21100544051 is an apocalyptic number.

21100544051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100544051 is an equidigital number, since it uses as much as digits as its factorization.

21100544051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

The spelling of 21100544051 in words is "twenty-one billion, one hundred million, five hundred forty-four thousand, fifty-one".