21143342414251 has 2 divisors, whose sum is σ = 21143342414252. Its totient is φ = 21143342414250.

The previous prime is 21143342414219. The next prime is 21143342414267. The reversal of 21143342414251 is 15241424334112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21143342414251 - 2⁵ = 21143342414219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21143342414251.

It is not a weakly prime, because it can be changed into another prime (21143342414281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571671207125 + 10571671207126.

It is an arithmetic number, because the mean of its divisors is an integer number (10571671207126).

Almost surely, 2^{21143342414251} is an apocalyptic number.

21143342414251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143342414251 is an equidigital number, since it uses as much as digits as its factorization.

21143342414251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 37.

Adding to 21143342414251 its reverse (15241424334112), we get a palindrome (36384766748363).

The spelling of 21143342414251 in words is "twenty-one trillion, one hundred forty-three billion, three hundred forty-two million, four hundred fourteen thousand, two hundred fifty-one".