21121112002211 has 4 divisors (see below), whose sum is σ = 22745812925472. Its totient is φ = 19496411078952.

The previous prime is 21121112002141. The next prime is 21121112002231. The reversal of 21121112002211 is 11220021112112.

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-21121112002211 is a prime.

It is a super-2 number, since 2×21121112002211² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121112002211.

It is not an unprimeable number, because it can be changed into a prime (21121112002231) 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, 812350461611 + ... + 812350461636.

It is an arithmetic number, because the mean of its divisors is an integer number (5686453231368).

Almost surely, 2^{21121112002211} is an apocalyptic number.

21121112002211 is a deficient number, since it is larger than the sum of its proper divisors (1624700923261).

21121112002211 is a wasteful number, since it uses less digits than its factorization.

21121112002211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624700923260.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121112002211 its reverse (11220021112112), we get a palindrome (32341133114323).

The spelling of 21121112002211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, two thousand, two hundred eleven".