21286520001 has 6 divisors (see below), whose sum is σ = 30747195570. Its totient is φ = 14191013328.

The previous prime is 21286519993. The next prime is 21286520053. The reversal of 21286520001 is 10002568212.

It is a happy number.

21286520001 is a `hidden beast` number, since 2 + 1 + 2 + 8 + 652 + 0 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11534760000 + 9751760001 = 107400^2 + 98751^2 .

It is not a de Polignac number, because 21286520001 - 2³ = 21286519993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21286520071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1182584436 + ... + 1182584453.

It is an arithmetic number, because the mean of its divisors is an integer number (5124532595).

Almost surely, 2^21286520001 is an apocalyptic number.

It is an amenable number.

21286520001 is a deficient number, since it is larger than the sum of its proper divisors (9460675569).

21286520001 is a wasteful number, since it uses less digits than its factorization.

21286520001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2365168895 (or 2365168892 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The spelling of 21286520001 in words is "twenty-one billion, two hundred eighty-six million, five hundred twenty thousand, one".