21121002611 has 2 divisors, whose sum is σ = 21121002612. Its totient is φ = 21121002610.

The previous prime is 21121002593. The next prime is 21121002629. The reversal of 21121002611 is 11620012112.

It is a balanced prime because it is at equal distance from previous prime (21121002593) and next prime (21121002629).

It is a cyclic number.

It is not a de Polignac number, because 21121002611 - 2³⁰ = 20047260787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21121002611.

It is not a weakly prime, because it can be changed into another prime (21121002211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560501305 + 10560501306.

It is an arithmetic number, because the mean of its divisors is an integer number (10560501306).

Almost surely, 2^21121002611 is an apocalyptic number.

21121002611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121002611 is an equidigital number, since it uses as much as digits as its factorization.

21121002611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21121002611 its reverse (11620012112), we get a palindrome (32741014723).

The spelling of 21121002611 in words is "twenty-one billion, one hundred twenty-one million, two thousand, six hundred eleven".