1102121172 has 18 divisors (see below), whose sum is σ = 2785917498. Its totient is φ = 367373712.

The previous prime is 1102121159. The next prime is 1102121173. The reversal of 1102121172 is 2711212011.

It can be written as a sum of positive squares in only one way, i.e., 754820676 + 347300496 = 27474^2 + 18636^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102121173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15307203 + ... + 15307274.

Almost surely, 2^1102121172 is an apocalyptic number.

1102121172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1102121172 is an abundant number, since it is smaller than the sum of its proper divisors (1683796326).

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

1102121172 is a wasteful number, since it uses less digits than its factorization.

1102121172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30614487 (or 30614482 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 1102121172 is about 33198.2103734524. The cubic root of 1102121172 is about 1032.9432177973.

Adding to 1102121172 its reverse (2711212011), we get a palindrome (3813333183).

The spelling of 1102121172 in words is "one billion, one hundred two million, one hundred twenty-one thousand, one hundred seventy-two".