1020502421 has 2 divisors, whose sum is σ = 1020502422. Its totient is φ = 1020502420.

The previous prime is 1020502411. The next prime is 1020502429. The reversal of 1020502421 is 1242050201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 955119025 + 65383396 = 30905^2 + 8086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020502421 - 2¹⁴ = 1020486037 is a prime.

It is a super-2 number, since 2×1020502421² = 2082850382533722482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020502421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020502429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510251210 + 510251211.

It is an arithmetic number, because the mean of its divisors is an integer number (510251211).

Almost surely, 2^1020502421 is an apocalyptic number.

It is an amenable number.

1020502421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020502421 is an equidigital number, since it uses as much as digits as its factorization.

1020502421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1020502421 is about 31945.3035828430. The cubic root of 1020502421 is about 1006.7879596818.

Adding to 1020502421 its reverse (1242050201), we get a palindrome (2262552622).

The spelling of 1020502421 in words is "one billion, twenty million, five hundred two thousand, four hundred twenty-one".