2021015551 has 2 divisors, whose sum is σ = 2021015552. Its totient is φ = 2021015550.

The previous prime is 2021015533. The next prime is 2021015599. The reversal of 2021015551 is 1555101202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021015551 - 2²³ = 2012626943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021015851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010507775 + 1010507776.

It is an arithmetic number, because the mean of its divisors is an integer number (1010507776).

Almost surely, 2^2021015551 is an apocalyptic number.

2021015551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021015551 is an equidigital number, since it uses as much as digits as its factorization.

2021015551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 2021015551 is about 44955.7065454431. The cubic root of 2021015551 is about 1264.3186717798.

Adding to 2021015551 its reverse (1555101202), we get a palindrome (3576116753).

The spelling of 2021015551 in words is "two billion, twenty-one million, fifteen thousand, five hundred fifty-one".