1021242242 has 4 divisors (see below), whose sum is σ = 1531863366. Its totient is φ = 510621120.

The previous prime is 1021242239. The next prime is 1021242247. The reversal of 1021242242 is 2422421201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2422421201 = 263 ⋅9210727.

It can be written as a sum of positive squares in only one way, i.e., 1013849281 + 7392961 = 31841^2 + 2719^2 .

It is not an unprimeable number, because it can be changed into a prime (1021242247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255310559 + ... + 255310562.

Almost surely, 2^1021242242 is an apocalyptic number.

1021242242 is a deficient number, since it is larger than the sum of its proper divisors (510621124).

1021242242 is an equidigital number, since it uses as much as digits as its factorization.

1021242242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510621123.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1021242242 is about 31956.8809804712. The cubic root of 1021242242 is about 1007.0311937787.

Adding to 1021242242 its reverse (2422421201), we get a palindrome (3443663443).

The spelling of 1021242242 in words is "one billion, twenty-one million, two hundred forty-two thousand, two hundred forty-two".