21021023102011 has 2 divisors, whose sum is σ = 21021023102012. Its totient is φ = 21021023102010.

The previous prime is 21021023102003. The next prime is 21021023102029. The reversal of 21021023102011 is 11020132012012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021023102011 - 2³ = 21021023102003 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021023102311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510511551005 + 10510511551006.

It is an arithmetic number, because the mean of its divisors is an integer number (10510511551006).

Almost surely, 2^{21021023102011} is an apocalyptic number.

21021023102011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021023102011 is an equidigital number, since it uses as much as digits as its factorization.

21021023102011 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 16.

Adding to 21021023102011 its reverse (11020132012012), we get a palindrome (32041155114023).

The spelling of 21021023102011 in words is "twenty-one trillion, twenty-one billion, twenty-three million, one hundred two thousand, eleven".