1102121442 has 48 divisors (see below), whose sum is σ = 2486173560. Its totient is φ = 352532736.

The previous prime is 1102121389. The next prime is 1102121477. The reversal of 1102121442 is 2441212011.

1102121442 is a `hidden beast` number, since 1 + 10 + 212 + 1 + 442 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1068701481 + 33419961 = 32691^2 + 5781^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37284 + ... + 59952.

Almost surely, 2^1102121442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1102121442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1243086780).

1102121442 is an abundant number, since it is smaller than the sum of its proper divisors (1384052118).

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

1102121442 is a wasteful number, since it uses less digits than its factorization.

1102121442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22787 (or 22784 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1102121442 is about 33198.2144399364. The cubic root of 1102121442 is about 1032.9433021482.

Adding to 1102121442 its reverse (2441212011), we get a palindrome (3543333453).

The spelling of 1102121442 in words is "one billion, one hundred two million, one hundred twenty-one thousand, four hundred forty-two".