1012420021 has 2 divisors, whose sum is σ = 1012420022. Its totient is φ = 1012420020.

The previous prime is 1012419971. The next prime is 1012420069. The reversal of 1012420021 is 1200242101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526702500 + 485717521 = 22950^2 + 22039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012420021 - 2⁷ = 1012419893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1012419983 and 1012420010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012420621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506210010 + 506210011.

It is an arithmetic number, because the mean of its divisors is an integer number (506210011).

Almost surely, 2^1012420021 is an apocalyptic number.

It is an amenable number.

1012420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012420021 is an equidigital number, since it uses as much as digits as its factorization.

1012420021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1012420021 is about 31818.5483798366. The cubic root of 1012420021 is about 1004.1229846355.

Adding to 1012420021 its reverse (1200242101), we get a palindrome (2212662122).

The spelling of 1012420021 in words is "one billion, twelve million, four hundred twenty thousand, twenty-one".