1020021451 has 2 divisors, whose sum is σ = 1020021452. Its totient is φ = 1020021450.

The previous prime is 1020021419. The next prime is 1020021461. The reversal of 1020021451 is 1541200201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020021451 - 2⁵ = 1020021419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020021461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510010725 + 510010726.

It is an arithmetic number, because the mean of its divisors is an integer number (510010726).

Almost surely, 2^1020021451 is an apocalyptic number.

1020021451 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020021451 is an equidigital number, since it uses as much as digits as its factorization.

1020021451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1020021451 is about 31937.7746720087. The cubic root of 1020021451 is about 1006.6297660674.

Adding to 1020021451 its reverse (1541200201), we get a palindrome (2561221652).

The spelling of 1020021451 in words is "one billion, twenty million, twenty-one thousand, four hundred fifty-one".