21507526740676 has 12 divisors (see below), whose sum is σ = 37640578284540. Its totient is φ = 10753075802240.

The previous prime is 21507526740659. The next prime is 21507526740743. The reversal of 21507526740676 is 67604762570512.

It can be written as a sum of positive squares in 2 ways, for example, as 15333693262276 + 6173833478400 = 3915826^2 + 2484720^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21507526740676.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171821641 + ... + 171946768.

It is an arithmetic number, because the mean of its divisors is an integer number (3136714857045).

Almost surely, 2^{21507526740676} is an apocalyptic number.

It is an amenable number.

21507526740676 is a deficient number, since it is larger than the sum of its proper divisors (16133051543864).

21507526740676 is a wasteful number, since it uses less digits than its factorization.

21507526740676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343784054 (or 343784052 counting only the distinct ones).

The product of its (nonzero) digits is 29635200, while the sum is 58.

The spelling of 21507526740676 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, seven hundred forty thousand, six hundred seventy-six".