211221212002111 has 4 divisors (see below), whose sum is σ = 213398750270272. Its totient is φ = 209043673733952.

The previous prime is 211221212002051. The next prime is 211221212002117. The reversal of 211221212002111 is 111200212122112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211221212002111 - 2¹⁹ = 211221211477823 is a prime.

It is a super-2 number, since 2×211221212002111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221212002117) 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, 1088769133935 + ... + 1088769134128.

It is an arithmetic number, because the mean of its divisors is an integer number (53349687567568).

Almost surely, 2^{211221212002111} is an apocalyptic number.

211221212002111 is a deficient number, since it is larger than the sum of its proper divisors (2177538268161).

211221212002111 is an equidigital number, since it uses as much as digits as its factorization.

211221212002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177538268160.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211221212002111 its reverse (111200212122112), we get a palindrome (322421424124223).

The spelling of 211221212002111 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two thousand, one hundred eleven".