1242052021 has 8 divisors (see below), whose sum is σ = 1494198080. Its totient is φ = 1008583488.

The previous prime is 1242051997. The next prime is 1242052039. The reversal of 1242052021 is 1202502421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1242052021 - 2⁵ = 1242051989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242052021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242052121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4669236 + ... + 4669501.

It is an arithmetic number, because the mean of its divisors is an integer number (186774760).

Almost surely, 2^1242052021 is an apocalyptic number.

It is an amenable number.

1242052021 is a deficient number, since it is larger than the sum of its proper divisors (252146059).

1242052021 is an equidigital number, since it uses as much as digits as its factorization.

1242052021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9338763.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 1242052021 is about 35242.7584192838. The cubic root of 1242052021 is about 1074.9293686422.

Adding to 1242052021 its reverse (1202502421), we get a palindrome (2444554442).

The spelling of 1242052021 in words is "one billion, two hundred forty-two million, fifty-two thousand, twenty-one".