1020342121 has 4 divisors (see below), whose sum is σ = 1022174532. Its totient is φ = 1018509712.

The previous prime is 1020342109. The next prime is 1020342131. The reversal of 1020342121 is 1212430201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 251666496 + 768675625 = 15864^2 + 27725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020342121 - 2¹³ = 1020333929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020342095 and 1020342104.

It is not an unprimeable number, because it can be changed into a prime (1020342131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 915370 + ... + 916483.

It is an arithmetic number, because the mean of its divisors is an integer number (255543633).

Almost surely, 2^1020342121 is an apocalyptic number.

It is an amenable number.

1020342121 is a deficient number, since it is larger than the sum of its proper divisors (1832411).

1020342121 is an equidigital number, since it uses as much as digits as its factorization.

1020342121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832410.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1020342121 is about 31942.7945083081. The cubic root of 1020342121 is about 1006.7352416749.

Adding to 1020342121 its reverse (1212430201), we get a palindrome (2232772322).

The spelling of 1020342121 in words is "one billion, twenty million, three hundred forty-two thousand, one hundred twenty-one".