4021869391 has 2 divisors, whose sum is σ = 4021869392. Its totient is φ = 4021869390.

The previous prime is 4021869361. The next prime is 4021869427. The reversal of 4021869391 is 1939681204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4021869391 - 2¹³ = 4021861199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021869311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010934695 + 2010934696.

It is an arithmetic number, because the mean of its divisors is an integer number (2010934696).

Almost surely, 2^4021869391 is an apocalyptic number.

4021869391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021869391 is an equidigital number, since it uses as much as digits as its factorization.

4021869391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 4021869391 is about 63418.2102475306. The cubic root of 4021869391 is about 1590.2887535119.

The spelling of 4021869391 in words is "four billion, twenty-one million, eight hundred sixty-nine thousand, three hundred ninety-one".