21516151120459 has 2 divisors, whose sum is σ = 21516151120460. Its totient is φ = 21516151120458.

The previous prime is 21516151120447. The next prime is 21516151120489. The reversal of 21516151120459 is 95402115161512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21516151120459 - 2¹⁷ = 21516150989387 is a prime.

It is a super-2 number, since 2×21516151120459² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21516151120489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10758075560229 + 10758075560230.

It is an arithmetic number, because the mean of its divisors is an integer number (10758075560230).

Almost surely, 2^{21516151120459} is an apocalyptic number.

21516151120459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21516151120459 is an equidigital number, since it uses as much as digits as its factorization.

21516151120459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 43.

The spelling of 21516151120459 in words is "twenty-one trillion, five hundred sixteen billion, one hundred fifty-one million, one hundred twenty thousand, four hundred fifty-nine".