21426011464397 has 2 divisors, whose sum is σ = 21426011464398. Its totient is φ = 21426011464396.

The previous prime is 21426011464391. The next prime is 21426011464411. The reversal of 21426011464397 is 79346411062412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16930377539716 + 4495633924681 = 4114654^2 + 2120291^2 .

It is a cyclic number.

It is not a de Polignac number, because 21426011464397 - 2⁴ = 21426011464381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21426011464391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10713005732198 + 10713005732199.

It is an arithmetic number, because the mean of its divisors is an integer number (10713005732199).

Almost surely, 2^{21426011464397} is an apocalyptic number.

It is an amenable number.

21426011464397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21426011464397 is an equidigital number, since it uses as much as digits as its factorization.

21426011464397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 21426011464397 in words is "twenty-one trillion, four hundred twenty-six billion, eleven million, four hundred sixty-four thousand, three hundred ninety-seven".