211221012111102 has 48 divisors (see below), whose sum is σ = 539895183040512. Its totient is φ = 58402123163280.

The previous prime is 211221012111091. The next prime is 211221012111103. The reversal of 211221012111102 is 201111210122112.

It is a happy number.

211221012111102 is a `hidden beast` number, since 211 + 221 + 0 + 121 + 1 + 110 + 2 = 666.

It is a super-2 number, since 2×211221012111102² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221012111103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27038016078 + ... + 27038023889.

It is an arithmetic number, because the mean of its divisors is an integer number (11247816313344).

Almost surely, 2^{211221012111102} is an apocalyptic number.

211221012111102 is an abundant number, since it is smaller than the sum of its proper divisors (328674170929410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221012111102 is a wasteful number, since it uses less digits than its factorization.

211221012111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54076040013 (or 54076040010 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 211221012111102 its reverse (201111210122112), we get a palindrome (412332222233214).

The spelling of 211221012111102 in words is "two hundred eleven trillion, two hundred twenty-one billion, twelve million, one hundred eleven thousand, one hundred two".