21232553011 has 2 divisors, whose sum is σ = 21232553012. Its totient is φ = 21232553010.

The previous prime is 21232552969. The next prime is 21232553051. The reversal of 21232553011 is 11035523212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232553011 - 2²¹ = 21230455859 is a prime.

It is a super-2 number, since 2×21232553011² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21232553051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616276505 + 10616276506.

It is an arithmetic number, because the mean of its divisors is an integer number (10616276506).

Almost surely, 2^21232553011 is an apocalyptic number.

21232553011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232553011 is an equidigital number, since it uses as much as digits as its factorization.

21232553011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The spelling of 21232553011 in words is "twenty-one billion, two hundred thirty-two million, five hundred fifty-three thousand, eleven".