21006206767436 has 24 divisors (see below), whose sum is σ = 41035380665664. Its totient is φ = 9326222876880.

The previous prime is 21006206767417. The next prime is 21006206767451. The reversal of 21006206767436 is 63476760260012.

It is a super-3 number, since 3×21006206767436³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5551321250 + ... + 5551325033.

It is an arithmetic number, because the mean of its divisors is an integer number (1709807527736).

Almost surely, 2^{21006206767436} is an apocalyptic number.

It is an amenable number.

21006206767436 is a deficient number, since it is larger than the sum of its proper divisors (20029173898228).

21006206767436 is a wasteful number, since it uses less digits than its factorization.

21006206767436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11102646341 (or 11102646339 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 50.

The spelling of 21006206767436 in words is "twenty-one trillion, six billion, two hundred six million, seven hundred sixty-seven thousand, four hundred thirty-six".