1242302021 has 4 divisors (see below), whose sum is σ = 1242406272. Its totient is φ = 1242197772.

The previous prime is 1242302011. The next prime is 1242302041. The reversal of 1242302021 is 1202032421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1242302021 - 2²⁶ = 1175193157 is a prime.

It is a super-2 number, since 2×1242302021² = 3086628622761368882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242302011) 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, 31541 + ... + 58986.

It is an arithmetic number, because the mean of its divisors is an integer number (310601568).

Almost surely, 2^1242302021 is an apocalyptic number.

It is an amenable number.

1242302021 is a deficient number, since it is larger than the sum of its proper divisors (104251).

1242302021 is an equidigital number, since it uses as much as digits as its factorization.

1242302021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104250.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1242302021 is about 35246.3050687586. The cubic root of 1242302021 is about 1075.0014843318.

Adding to 1242302021 its reverse (1202032421), we get a palindrome (2444334442).

The spelling of 1242302021 in words is "one billion, two hundred forty-two million, three hundred two thousand, twenty-one".