21102001121211 has 4 divisors (see below), whose sum is σ = 28136001494952. Its totient is φ = 14068000747472.

The previous prime is 21102001121209. The next prime is 21102001121213. The reversal of 21102001121211 is 11212110020112.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21102001121209) and next prime (21102001121213).

It is a cyclic number.

It is not a de Polignac number, because 21102001121211 - 2¹ = 21102001121209 is a prime.

It is a super-2 number, since 2×21102001121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21102001121213) 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, 3517000186866 + ... + 3517000186871.

It is an arithmetic number, because the mean of its divisors is an integer number (7034000373738).

Almost surely, 2^{21102001121211} is an apocalyptic number.

21102001121211 is a deficient number, since it is larger than the sum of its proper divisors (7034000373741).

21102001121211 is an equidigital number, since it uses as much as digits as its factorization.

21102001121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034000373740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102001121211 its reverse (11212110020112), we get a palindrome (32314111141323).

The spelling of 21102001121211 in words is "twenty-one trillion, one hundred two billion, one million, one hundred twenty-one thousand, two hundred eleven".