1021420451 has 2 divisors, whose sum is σ = 1021420452. Its totient is φ = 1021420450.

The previous prime is 1021420423. The next prime is 1021420459. The reversal of 1021420451 is 1540241201.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1540241201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021420451 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021420459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510710225 + 510710226.

It is an arithmetic number, because the mean of its divisors is an integer number (510710226).

Almost surely, 2^1021420451 is an apocalyptic number.

1021420451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021420451 is an equidigital number, since it uses as much as digits as its factorization.

1021420451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1021420451 is about 31959.6691315789. The cubic root of 1021420451 is about 1007.0897667522.

Adding to 1021420451 its reverse (1540241201), we get a palindrome (2561661652).

The spelling of 1021420451 in words is "one billion, twenty-one million, four hundred twenty thousand, four hundred fifty-one".