1340042121 has 24 divisors (see below), whose sum is σ = 2184399360. Its totient is φ = 784140000.

The previous prime is 1340042113. The next prime is 1340042141. The reversal of 1340042121 is 1212400431.

It is not a de Polignac number, because 1340042121 - 2³ = 1340042113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340042094 and 1340042103.

It is not an unprimeable number, because it can be changed into a prime (1340042111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230505 + ... + 236246.

It is an arithmetic number, because the mean of its divisors is an integer number (91016640).

Almost surely, 2^1340042121 is an apocalyptic number.

1340042121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1340042121 is a deficient number, since it is larger than the sum of its proper divisors (844357239).

1340042121 is a wasteful number, since it uses less digits than its factorization.

1340042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466797 (or 466794 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1340042121 is about 36606.5857599422. The cubic root of 1340042121 is about 1102.4853228953.

Adding to 1340042121 its reverse (1212400431), we get a palindrome (2552442552).

The spelling of 1340042121 in words is "one billion, three hundred forty million, forty-two thousand, one hundred twenty-one".