21486365429951 has 2 divisors, whose sum is σ = 21486365429952. Its totient is φ = 21486365429950.

The previous prime is 21486365429939. The next prime is 21486365429959. The reversal of 21486365429951 is 15992456368412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21486365429951 - 2¹⁴ = 21486365413567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21486365429959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10743182714975 + 10743182714976.

It is an arithmetic number, because the mean of its divisors is an integer number (10743182714976).

Almost surely, 2^{21486365429951} is an apocalyptic number.

21486365429951 is a deficient number, since it is larger than the sum of its proper divisors (1).

21486365429951 is an equidigital number, since it uses as much as digits as its factorization.

21486365429951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111974400, while the sum is 65.

The spelling of 21486365429951 in words is "twenty-one trillion, four hundred eighty-six billion, three hundred sixty-five million, four hundred twenty-nine thousand, nine hundred fifty-one".