1021354021 has 2 divisors, whose sum is σ = 1021354022. Its totient is φ = 1021354020.

The previous prime is 1021354013. The next prime is 1021354091. The reversal of 1021354021 is 1204531201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 793041921 + 228312100 = 28161^2 + 15110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021354021 - 2³ = 1021354013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021354021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021354091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510677010 + 510677011.

It is an arithmetic number, because the mean of its divisors is an integer number (510677011).

Almost surely, 2^1021354021 is an apocalyptic number.

It is an amenable number.

1021354021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021354021 is an equidigital number, since it uses as much as digits as its factorization.

1021354021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1021354021 is about 31958.6298360865. The cubic root of 1021354021 is about 1007.0679336199.

Adding to 1021354021 its reverse (1204531201), we get a palindrome (2225885222).

The spelling of 1021354021 in words is "one billion, twenty-one million, three hundred fifty-four thousand, twenty-one".