1242020141 has 4 divisors (see below), whose sum is σ = 1242100284. Its totient is φ = 1241940000.

The previous prime is 1242020137. The next prime is 1242020147. The reversal of 1242020141 is 1410202421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1410202421 = 41 ⋅34395181.

It can be written as a sum of positive squares in 2 ways, for example, as 510534025 + 731486116 = 22595^2 + 27046^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242020141 - 2² = 1242020137 is a prime.

It is a super-2 number, since 2×1242020141² = 3085228061299319762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242020147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8570 + ... + 50571.

It is an arithmetic number, because the mean of its divisors is an integer number (310525071).

Almost surely, 2^1242020141 is an apocalyptic number.

It is an amenable number.

1242020141 is a deficient number, since it is larger than the sum of its proper divisors (80143).

1242020141 is an equidigital number, since it uses as much as digits as its factorization.

1242020141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80142.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1242020141 is about 35242.3061248835. The cubic root of 1242020141 is about 1074.9201717538.

Adding to 1242020141 its reverse (1410202421), we get a palindrome (2652222562).

The spelling of 1242020141 in words is "one billion, two hundred forty-two million, twenty thousand, one hundred forty-one".