102012111220 has 24 divisors (see below), whose sum is σ = 214277440104. Its totient is φ = 40794938496.

The previous prime is 102012111167. The next prime is 102012111247. The reversal of 102012111220 is 22111210201.

It can be written as a sum of positive squares in 4 ways, for example, as 25015850896 + 76996260324 = 158164^2 + 277482^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 102012111220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534399 + ... + 699718.

It is an arithmetic number, because the mean of its divisors is an integer number (8928226671).

Almost surely, 2^102012111220 is an apocalyptic number.

102012111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102012111220 is an abundant number, since it is smaller than the sum of its proper divisors (112265328884).

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

102012111220 is a wasteful number, since it uses less digits than its factorization.

102012111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238259 (or 1238257 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102012111220 its reverse (22111210201), we get a palindrome (124123321421).

The spelling of 102012111220 in words is "one hundred two billion, twelve million, one hundred eleven thousand, two hundred twenty".