21091054043 has 2 divisors, whose sum is σ = 21091054044. Its totient is φ = 21091054042.

The previous prime is 21091054037. The next prime is 21091054123. The reversal of 21091054043 is 34045019012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21091054043 - 2¹⁶ = 21090988507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21091053997 and 21091054015.

It is not a weakly prime, because it can be changed into another prime (21091054013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10545527021 + 10545527022.

It is an arithmetic number, because the mean of its divisors is an integer number (10545527022).

Almost surely, 2^21091054043 is an apocalyptic number.

21091054043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21091054043 is an equidigital number, since it uses as much as digits as its factorization.

21091054043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21091054043 in words is "twenty-one billion, ninety-one million, fifty-four thousand, forty-three".