21246266344 has 8 divisors (see below), whose sum is σ = 39836749410. Its totient is φ = 10623133168.

The previous prime is 21246266333. The next prime is 21246266369. The reversal of 21246266344 is 44366264212.

It can be written as a sum of positive squares in only one way, i.e., 20725057444 + 521208900 = 143962^2 + 22830^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21246266297 and 21246266306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1327891639 + ... + 1327891654.

Almost surely, 2^21246266344 is an apocalyptic number.

It is an amenable number.

21246266344 is a deficient number, since it is larger than the sum of its proper divisors (18590483066).

21246266344 is a wasteful number, since it uses less digits than its factorization.

21246266344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655783299 (or 2655783295 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The spelling of 21246266344 in words is "twenty-one billion, two hundred forty-six million, two hundred sixty-six thousand, three hundred forty-four".