102121020011 has 4 divisors (see below), whose sum is σ = 102387654912. Its totient is φ = 101854385112.

The previous prime is 102121019969. The next prime is 102121020017. The reversal of 102121020011 is 110020121201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102121020011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121019974 and 102121020001.

It is not an unprimeable number, because it can be changed into a prime (102121020017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133316876 + ... + 133317641.

It is an arithmetic number, because the mean of its divisors is an integer number (25596913728).

Almost surely, 2^102121020011 is an apocalyptic number.

102121020011 is a deficient number, since it is larger than the sum of its proper divisors (266634901).

102121020011 is an equidigital number, since it uses as much as digits as its factorization.

102121020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266634900.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102121020011 its reverse (110020121201), we get a palindrome (212141141212).

The spelling of 102121020011 in words is "one hundred two billion, one hundred twenty-one million, twenty thousand, eleven".