102111211001220 has 24 divisors (see below), whose sum is σ = 285911390803584. Its totient is φ = 27229656266976.

The previous prime is 102111211001153. The next prime is 102111211001227. The reversal of 102111211001220 is 22100112111201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 102111211001220.

It is not an unprimeable number, because it can be changed into a prime (102111211001227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850926758284 + ... + 850926758403.

It is an arithmetic number, because the mean of its divisors is an integer number (11912974616816).

Almost surely, 2^{102111211001220} is an apocalyptic number.

102111211001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111211001220 is an abundant number, since it is smaller than the sum of its proper divisors (183800179802364).

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

102111211001220 is a wasteful number, since it uses less digits than its factorization.

102111211001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701853516699 (or 1701853516697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 102111211001220 its reverse (22100112111201), we get a palindrome (124211323112421).

The spelling of 102111211001220 in words is "one hundred two trillion, one hundred eleven billion, two hundred eleven million, one thousand, two hundred twenty".