21286298756 has 6 divisors (see below), whose sum is σ = 37251022830. Its totient is φ = 10643149376.

The previous prime is 21286298749. The next prime is 21286298767. The reversal of 21286298756 is 65789268212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19099240000 + 2187058756 = 138200^2 + 46766^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2660787341 + ... + 2660787348.

It is an arithmetic number, because the mean of its divisors is an integer number (6208503805).

Almost surely, 2^21286298756 is an apocalyptic number.

It is an amenable number.

21286298756 is a deficient number, since it is larger than the sum of its proper divisors (15964724074).

21286298756 is a wasteful number, since it uses less digits than its factorization.

21286298756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321574693 (or 5321574691 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The spelling of 21286298756 in words is "twenty-one billion, two hundred eighty-six million, two hundred ninety-eight thousand, seven hundred fifty-six".