21402051013943 has 2 divisors, whose sum is σ = 21402051013944. Its totient is φ = 21402051013942.

The previous prime is 21402051013909. The next prime is 21402051014023. The reversal of 21402051013943 is 34931015020412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21402051013943 - 2¹⁶ = 21402050948407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21402051013043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701025506971 + 10701025506972.

It is an arithmetic number, because the mean of its divisors is an integer number (10701025506972).

Almost surely, 2^{21402051013943} is an apocalyptic number.

21402051013943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402051013943 is an equidigital number, since it uses as much as digits as its factorization.

21402051013943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21402051013943 in words is "twenty-one trillion, four hundred two billion, fifty-one million, thirteen thousand, nine hundred forty-three".