21506076012706 has 4 divisors (see below), whose sum is σ = 32259114019062. Its totient is φ = 10753038006352.

The previous prime is 21506076012691. The next prime is 21506076012721. The reversal of 21506076012706 is 60721067060512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21506076012691) and next prime (21506076012721).

It can be written as a sum of positive squares in only one way, i.e., 20729271749481 + 776804263225 = 4552941^2 + 881365^2 .

It is a super-2 number, since 2×21506076012706² (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 as a sum of consecutive naturals, namely, 5376519003175 + ... + 5376519003178.

Almost surely, 2^{21506076012706} is an apocalyptic number.

21506076012706 is a deficient number, since it is larger than the sum of its proper divisors (10753038006356).

21506076012706 is a wasteful number, since it uses less digits than its factorization.

21506076012706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10753038006355.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 21506076012706 in words is "twenty-one trillion, five hundred six billion, seventy-six million, twelve thousand, seven hundred six".