2021152391 has 2 divisors, whose sum is σ = 2021152392. Its totient is φ = 2021152390.

The previous prime is 2021152381. The next prime is 2021152411. The reversal of 2021152391 is 1932511202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021152391 - 2²² = 2016958087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021152391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021152381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010576195 + 1010576196.

It is an arithmetic number, because the mean of its divisors is an integer number (1010576196).

Almost surely, 2^2021152391 is an apocalyptic number.

2021152391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021152391 is an equidigital number, since it uses as much as digits as its factorization.

2021152391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 2021152391 is about 44957.2284621728. The cubic root of 2021152391 is about 1264.3472061903.

Adding to 2021152391 its reverse (1932511202), we get a palindrome (3953663593).

The spelling of 2021152391 in words is "two billion, twenty-one million, one hundred fifty-two thousand, three hundred ninety-one".