21506076012705 has 32 divisors (see below), whose sum is σ = 36675106553088. Its totient is φ = 10723715328000.

The previous prime is 21506076012691. The next prime is 21506076012721. The reversal of 21506076012705 is 50721067060512.

It is a happy number.

It is not a de Polignac number, because 21506076012705 - 2⁹ = 21506076012193 is a prime.

It is a super-2 number, since 2×21506076012705² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279224916 + ... + 279301925.

It is an arithmetic number, because the mean of its divisors is an integer number (1146097079784).

Almost surely, 2^{21506076012705} is an apocalyptic number.

It is an amenable number.

21506076012705 is a deficient number, since it is larger than the sum of its proper divisors (15169030540383).

21506076012705 is a wasteful number, since it uses less digits than its factorization.

21506076012705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558527017.

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 21506076012705 in words is "twenty-one trillion, five hundred six billion, seventy-six million, twelve thousand, seven hundred five".