102111420 has 24 divisors (see below), whose sum is σ = 285912144. Its totient is φ = 27229696.

The previous prime is 102111397. The next prime is 102111431. The reversal of 102111420 is 24111201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 102111396 and 102111405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850869 + ... + 850988.

It is an arithmetic number, because the mean of its divisors is an integer number (11913006).

Almost surely, 2^102111420 is an apocalyptic number.

102111420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111420 is an abundant number, since it is smaller than the sum of its proper divisors (183800724).

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

102111420 is a wasteful number, since it uses less digits than its factorization.

102111420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701869 (or 1701867 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 102111420 is about 10105.0195447609. The cubic root of 102111420 is about 467.4029386609.

Adding to 102111420 its reverse (24111201), we get a palindrome (126222621).

The spelling of 102111420 in words is "one hundred two million, one hundred eleven thousand, four hundred twenty".