21012201211 has 2 divisors, whose sum is σ = 21012201212. Its totient is φ = 21012201210.

The previous prime is 21012201113. The next prime is 21012201271. The reversal of 21012201211 is 11210221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21012201211 - 2¹³ = 21012193019 is a prime.

It is a super-3 number, since 3×21012201211³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012201191 and 21012201200.

It is not a weakly prime, because it can be changed into another prime (21012201271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506100605 + 10506100606.

It is an arithmetic number, because the mean of its divisors is an integer number (10506100606).

Almost surely, 2^21012201211 is an apocalyptic number.

21012201211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012201211 is an equidigital number, since it uses as much as digits as its factorization.

21012201211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012201211 its reverse (11210221012), we get a palindrome (32222422223).

The spelling of 21012201211 in words is "twenty-one billion, twelve million, two hundred one thousand, two hundred eleven".