21116151515029 has 2 divisors, whose sum is σ = 21116151515030. Its totient is φ = 21116151515028.

The previous prime is 21116151515023. The next prime is 21116151515057. The reversal of 21116151515029 is 92051515161112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19516090960804 + 1600060554225 = 4417702^2 + 1264935^2 .

It is a cyclic number.

It is not a de Polignac number, because 21116151515029 - 2¹³ = 21116151506837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21116151514982 and 21116151515000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116151515023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558075757514 + 10558075757515.

It is an arithmetic number, because the mean of its divisors is an integer number (10558075757515).

Almost surely, 2^{21116151515029} is an apocalyptic number.

It is an amenable number.

21116151515029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116151515029 is an equidigital number, since it uses as much as digits as its factorization.

21116151515029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 40.

The spelling of 21116151515029 in words is "twenty-one trillion, one hundred sixteen billion, one hundred fifty-one million, five hundred fifteen thousand, twenty-nine".