21221012022011 has 2 divisors, whose sum is σ = 21221012022012. Its totient is φ = 21221012022010.

The previous prime is 21221012021977. The next prime is 21221012022107. The reversal of 21221012022011 is 11022021012212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221012022011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221012027011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610506011005 + 10610506011006.

It is an arithmetic number, because the mean of its divisors is an integer number (10610506011006).

Almost surely, 2^{21221012022011} is an apocalyptic number.

21221012022011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221012022011 is an equidigital number, since it uses as much as digits as its factorization.

21221012022011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221012022011 its reverse (11022021012212), we get a palindrome (32243033034223).

The spelling of 21221012022011 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, twenty-two thousand, eleven".