21041535071 has 2 divisors, whose sum is σ = 21041535072. Its totient is φ = 21041535070.

The previous prime is 21041535007. The next prime is 21041535091. The reversal of 21041535071 is 17053514012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21041535071 - 2⁶ = 21041535007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21041535091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520767535 + 10520767536.

It is an arithmetic number, because the mean of its divisors is an integer number (10520767536).

Almost surely, 2^21041535071 is an apocalyptic number.

21041535071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041535071 is an equidigital number, since it uses as much as digits as its factorization.

21041535071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 21041535071 in words is "twenty-one billion, forty-one million, five hundred thirty-five thousand, seventy-one".