221020111212102 has 48 divisors (see below), whose sum is σ = 507684672822912. Its totient is φ = 69369869249280.

The previous prime is 221020111212083. The next prime is 221020111212119. The reversal of 221020111212102 is 201212111020122.

221020111212102 is a `hidden beast` number, since 221 + 0 + 20 + 111 + 212 + 102 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5352592723 + ... + 5352634014.

It is an arithmetic number, because the mean of its divisors is an integer number (10576764017144).

Almost surely, 2^{221020111212102} is an apocalyptic number.

221020111212102 is an abundant number, since it is smaller than the sum of its proper divisors (286664561610810).

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

221020111212102 is a wasteful number, since it uses less digits than its factorization.

221020111212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10705226813 (or 10705226810 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221020111212102 its reverse (201212111020122), we get a palindrome (422232222232224).

The spelling of 221020111212102 in words is "two hundred twenty-one trillion, twenty billion, one hundred eleven million, two hundred twelve thousand, one hundred two".