21501435041011 has 2 divisors, whose sum is σ = 21501435041012. Its totient is φ = 21501435041010.

The previous prime is 21501435041003. The next prime is 21501435041117. The reversal of 21501435041011 is 11014053410512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21501435041011 - 2³ = 21501435041003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21501435041311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750717520505 + 10750717520506.

It is an arithmetic number, because the mean of its divisors is an integer number (10750717520506).

Almost surely, 2^{21501435041011} is an apocalyptic number.

21501435041011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501435041011 is an equidigital number, since it uses as much as digits as its factorization.

21501435041011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 21501435041011 its reverse (11014053410512), we get a palindrome (32515488451523).

The spelling of 21501435041011 in words is "twenty-one trillion, five hundred one billion, four hundred thirty-five million, forty-one thousand, eleven".