1421011021 has 2 divisors, whose sum is σ = 1421011022. Its totient is φ = 1421011020.

The previous prime is 1421011003. The next prime is 1421011051. The reversal of 1421011021 is 1201101241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1230957225 + 190053796 = 35085^2 + 13786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421011021 - 2⁹ = 1421010509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421010992 and 1421011010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421011051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710505510 + 710505511.

It is an arithmetic number, because the mean of its divisors is an integer number (710505511).

Almost surely, 2^1421011021 is an apocalyptic number.

It is an amenable number.

1421011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421011021 is an equidigital number, since it uses as much as digits as its factorization.

1421011021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1421011021 is about 37696.2998316811. The cubic root of 1421011021 is about 1124.2575568159.

Adding to 1421011021 its reverse (1201101241), we get a palindrome (2622112262).

The spelling of 1421011021 in words is "one billion, four hundred twenty-one million, eleven thousand, twenty-one".