21152121083 has 2 divisors, whose sum is σ = 21152121084. Its totient is φ = 21152121082.

The previous prime is 21152121079. The next prime is 21152121091. The reversal of 21152121083 is 38012125112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21152121083 - 2² = 21152121079 is a prime.

It is not a weakly prime, because it can be changed into another prime (21152121043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576060541 + 10576060542.

It is an arithmetic number, because the mean of its divisors is an integer number (10576060542).

Almost surely, 2^21152121083 is an apocalyptic number.

21152121083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152121083 is an equidigital number, since it uses as much as digits as its factorization.

21152121083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

Adding to 21152121083 its reverse (38012125112), we get a palindrome (59164246195).

The spelling of 21152121083 in words is "twenty-one billion, one hundred fifty-two million, one hundred twenty-one thousand, eighty-three".