2143860400021 has 2 divisors, whose sum is σ = 2143860400022. Its totient is φ = 2143860400020.

The previous prime is 2143860399953. The next prime is 2143860400103. The reversal of 2143860400021 is 1200040683412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1212452040996 + 931408359025 = 1101114^2 + 965095^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143860400021 - 2⁹ = 2143860399509 is a prime.

It is a super-2 number, since 2×2143860400021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143860400421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071930200010 + 1071930200011.

It is an arithmetic number, because the mean of its divisors is an integer number (1071930200011).

Almost surely, 2^{2143860400021} is an apocalyptic number.

It is an amenable number.

2143860400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143860400021 is an equidigital number, since it uses as much as digits as its factorization.

2143860400021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 2143860400021 in words is "two trillion, one hundred forty-three billion, eight hundred sixty million, four hundred thousand, twenty-one".