1121402138 has 16 divisors (see below), whose sum is σ = 1689442920. Its totient is φ = 558260736.

The previous prime is 1121402119. The next prime is 1121402147. The reversal of 1121402138 is 8312041211.

It can be written as a sum of positive squares in 4 ways, for example, as 1010794849 + 110607289 = 31793^2 + 10517^2 .

It is a super-2 number, since 2×1121402138² = 2515085510221942088, which contains 22 as substring.

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, 540968 + ... + 543036.

Almost surely, 2^1121402138 is an apocalyptic number.

1121402138 is a deficient number, since it is larger than the sum of its proper divisors (568040782).

1121402138 is a wasteful number, since it uses less digits than its factorization.

1121402138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1121402138 is about 33487.3429522260. The cubic root of 1121402138 is about 1038.9320082984.

Adding to 1121402138 its reverse (8312041211), we get a palindrome (9433443349).

The spelling of 1121402138 in words is "one billion, one hundred twenty-one million, four hundred two thousand, one hundred thirty-eight".