21416863088477 has 2 divisors, whose sum is σ = 21416863088478. Its totient is φ = 21416863088476.

The previous prime is 21416863088459. The next prime is 21416863088527. The reversal of 21416863088477 is 77488036861412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13787661154276 + 7629201934201 = 3713174^2 + 2762101^2 .

It is a cyclic number.

It is not a de Polignac number, because 21416863088477 - 2¹⁶ = 21416863022941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21416863088407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708431544238 + 10708431544239.

It is an arithmetic number, because the mean of its divisors is an integer number (10708431544239).

Almost surely, 2^{21416863088477} is an apocalyptic number.

It is an amenable number.

21416863088477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416863088477 is an equidigital number, since it uses as much as digits as its factorization.

21416863088477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86704128, while the sum is 65.

The spelling of 21416863088477 in words is "twenty-one trillion, four hundred sixteen billion, eight hundred sixty-three million, eighty-eight thousand, four hundred seventy-seven".