102120406 has 4 divisors (see below), whose sum is σ = 153180612. Its totient is φ = 51060202.

The previous prime is 102120371. The next prime is 102120433. The reversal of 102120406 is 604021201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604021201 = 7 ⋅86288743.

It is a self number, because there is not a number n which added to its sum of digits gives 102120406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25530100 + ... + 25530103.

It is an arithmetic number, because the mean of its divisors is an integer number (38295153).

Almost surely, 2^102120406 is an apocalyptic number.

102120406 is a deficient number, since it is larger than the sum of its proper divisors (51060206).

102120406 is an equidigital number, since it uses as much as digits as its factorization.

102120406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51060205.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 102120406 is about 10105.4641654899. The cubic root of 102120406 is about 467.4166490425.

Adding to 102120406 its reverse (604021201), we get a palindrome (706141607).

The spelling of 102120406 in words is "one hundred two million, one hundred twenty thousand, four hundred six".