4020121423 has 2 divisors, whose sum is σ = 4020121424. Its totient is φ = 4020121422.

The previous prime is 4020121411. The next prime is 4020121429. The reversal of 4020121423 is 3241210204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4020121423 is a prime.

It is a super-2 number, since 2×4020121423² = 32322752511327089858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4020121423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4020121429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010060711 + 2010060712.

It is an arithmetic number, because the mean of its divisors is an integer number (2010060712).

Almost surely, 2^4020121423 is an apocalyptic number.

4020121423 is a deficient number, since it is larger than the sum of its proper divisors (1).

4020121423 is an equidigital number, since it uses as much as digits as its factorization.

4020121423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4020121423 is about 63404.4274715891. The cubic root of 4020121423 is about 1590.0583319185.

Adding to 4020121423 its reverse (3241210204), we get a palindrome (7261331627).

The spelling of 4020121423 in words is "four billion, twenty million, one hundred twenty-one thousand, four hundred twenty-three".